| 单词 | atomic number |
| 例句 | The chemistry of an atom depends only on the number of electrons, which equals the number of protons, and which is called the atomic number. Cosmos 1980-01-01T00:00:00Z The horizontal rows, meanwhile, arrange the chemicals in ascending order by the number of protons in their nuclei–what is known as their atomic number. A Short History of Nearly Everything 2003-05-06T00:00:00Z You might as well have asked them to name the atomic numbers of all the inert gases. Okay for Now 2011-04-05T00:00:00Z He explained using oxygen with atomic number 8. Russian scientist created a chemistry tool with room for discovery 2019-03-05T05:00:00Z Katie Hafner: Uranium is the last of the naturally occurring elements on the periodic table, with an atomic number of 92. She Cracked the Mystery of How to Split the Atom, But Someone Else Got the Nobel Prize for the Discovery 2023-09-07T04:00:00Z The only result that popped up pertained to chemistry: specifically, to the periodic table and the atomic numbers of the alkaline earth metals. What Number Comes Next? The Encyclopedia of Integer Sequences Knows. 2023-05-21T04:00:00Z Each contains a different number of protons and neutrons, giving it its own atomic number and mass number. Concepts of Biology 2013-04-25T00:00:00Z Heavy REEs—those with high atomic numbers, including dysprosium, yttrium, and terbium—are most commonly extracted from masses of clay formed through eons of weathering of igneous rocks such as granite. It’s electric! Technique could clean up mining of valuable rare earth elements 2022-11-01T04:00:00Z Chemical composition of the medium, as characterized by its atomic number Z , is not important here. College Physics for AP Courses 2015-08-12T00:00:00Z Note that all isotopes of elements with atomic numbers greater than 83 are unstable. Chemistry 2019-02-14T00:00:00Z Figure 2.5 The periodic table shows the atomic mass and atomic number of each element. Biology for AP Courses 2022-06-09T00:00:00Z Because of these characteristics, the elements are arranged into the periodic table of elements, a chart of the elements that includes the atomic number and relative atomic mass of each element. Concepts of Biology 2013-04-25T00:00:00Z Elements are represented by one- or two-letter symbols and organized by atomic number, which is how many protons they have. Miller & Levine Biology 2018-01-01T00:00:00Z In order for charge to be conserved overall, the nucleus must gain a positive charge, increasing its atomic number by 1, resulting in 241 Cm. College Physics for AP Courses 2015-08-12T00:00:00Z To describe a nuclear reaction, we use an equation that identifies the nuclides involved in the reaction, their mass numbers and atomic numbers, and the other particles involved in the reaction. Chemistry 2019-02-14T00:00:00Z The atomic number appears above the symbol for the element and the approximate atomic mass appears below it. Biology for AP Courses 2022-06-09T00:00:00Z The atomic number of an element is equal to the number of protons that element contains. Environmental Biology 2018-09-06T00:00:00Z Its atomic number is 14 and its atomic mass is 28. Physical Geology 2015-01-01T00:00:00Z Greater contrast can be achieved by injecting a substance with a large atomic number, such as barium or iodine. College Physics for AP Courses 2015-08-12T00:00:00Z If the atomic number and the mass number of all but one of the particles in a nuclear reaction are known, we can identify the particle by balancing the reaction. Chemistry 2019-02-14T00:00:00Z Thus, each element, at least when electrically neutral, has a characteristic number of electrons equal to its atomic number. Biology for AP Courses 2022-06-09T00:00:00Z Therefore, it is possible to determine the number of neutrons by subtracting the atomic number from the mass number. Environmental Biology 2018-09-06T00:00:00Z The number of protons is the atomic number, and the number of protons plus neutrons is the atomic mass. Physical Geology 2015-01-01T00:00:00Z This systematic organization is related to the number of electrons in a neutral atom, called the atomic number, Z . College Physics for AP Courses 2015-08-12T00:00:00Z For example, any atom that contains six protons is the element carbon and has the atomic number 6, regardless of how many neutrons or electrons it may have. Chemistry 2019-02-14T00:00:00Z The number of protons determines an element’s atomic number and is used to distinguish one element from another. Biology for AP Courses 2022-06-09T00:00:00Z The atomic number for the element fluorine is 9 and its mass number is 19. Environmental Biology 2018-09-06T00:00:00Z The new proton increases the element’s atomic number by one, forming a new element with the same atomic mass as the parent isotope. An Introduction to Geology 2017-01-01T00:00:00Z The atomic number of an atom is the number of protons in that atom's nucleus. College Physics for AP Courses 2015-08-12T00:00:00Z Therefore, the atomic number also indicates the number of electrons in an atom. Chemistry 2019-02-14T00:00:00Z In addition to providing the atomic number for each element, the periodic table also displays the element’s atomic mass. Biology for AP Courses 2022-06-09T00:00:00Z The periodic table is a useful device because for each element, it identifies the chemical symbol, the atomic number, and the mass number, while organizing elements according to their propensity to react with other elements. Anatomy and Physiology 2013-06-19T00:00:00Z The atomic number is reduced by one and the mass number remains the same. An Introduction to Geology 2017-01-01T00:00:00Z Make a prediction as to what happens to electromagnetic repulsion as the atomic number gets larger. College Physics for AP Courses 2015-08-12T00:00:00Z The number of neutrons is therefore the difference between the mass number and the atomic number: A – Z = number of neutrons. Chemistry 2019-02-14T00:00:00Z The mass number and atomic number of carbon-13 is 13 and 12 , while that of carbon-12 is 12 and 6 , respectively. Biology for AP Courses 2022-06-09T00:00:00Z The elements are arranged in order of their atomic number, with hydrogen and helium at the top of the table, and the more massive elements below. Anatomy and Physiology 2013-06-19T00:00:00Z The collision reduces the atomic number by one, changing it from seven to six, changing the nitrogen into carbon with the same mass number of 14. An Introduction to Geology 2017-01-01T00:00:00Z The iconic periodic table of elements, devised by the Russian chemist Dmitri Mendeleev, is a two-dimensional array of the chemical elements, ordered by atomic number and arranged 18 across by orbitals. Is It Time to Upend the Periodic Table? 2019-08-27T04:00:00Z Most symbols have one or two letters, but three-letter symbols have been used to describe some elements that have atomic numbers greater than 112. Chemistry 2019-02-14T00:00:00Z The mass number and atomic number of carbon-13 is 13 and 13 , while that of carbon-12 is 12 and 6 , respectively. Biology for AP Courses 2022-06-09T00:00:00Z Thus, the atomic number, which is the number of protons in the nucleus of the atom, identifies the element. Anatomy and Physiology 2013-06-19T00:00:00Z This uniqueness led scientists to develop a periodic table of the elements, a tabular arrangement of all known elements listed in order of their atomic number. An Introduction to Geology 2017-01-01T00:00:00Z But as the atomic numbers go up, deviations will increase rapidly, challenging the periodic table’s schematic integrity. Is It Time to Upend the Periodic Table? 2019-08-27T04:00:00Z The atomic number is sometimes written as a subscript preceding the symbol, but since this number defines the element’s identity, as does its symbol, it is often omitted. Chemistry 2019-02-14T00:00:00Z The mass number and atomic number of carbon-13 is 13 and 12 , while that of carbon-12 is 12 and 12 , respectively. Biology for AP Courses 2022-06-09T00:00:00Z Because an atom usually has the same number of electrons as protons, the atomic number identifies the usual number of electrons as well. Anatomy and Physiology 2013-06-19T00:00:00Z Recall that the number of neutrons added to the atomic number gives the atomic mass. An Introduction to Geology 2017-01-01T00:00:00Z If Charles Janet was right in his prediction that the element with atomic number 120, provisionally Unbinilium, would be the last such element, many people competing in Pi Day celebrations could achieve chemical piety forever! Chemical π 2019-03-14T04:00:00Z For example, magnesium exists as a mixture of three isotopes, each with an atomic number of 12 and with mass numbers of 24, 25, and 26, respectively. Chemistry 2019-02-14T00:00:00Z Depending on the size of the chunk, scientists might even leap to much higher element numbers instead of inching along one atomic number at a time. A storied Russian lab is trying to push the periodic table past its limits—and uncover exotic new elements 2019-01-30T05:00:00Z Its atomic number is nine, and it has seven electrons in its valence shell. Anatomy and Physiology 2013-06-19T00:00:00Z When an atom loses two protons from its nucleus, lowering its atomic number, it is transformed into an element that is two atomic numbers lower on the Periodic Table of the Elements. An Introduction to Geology 2017-01-01T00:00:00Z So for instance, since Lithium and Beryllium have atomic numbers 3 and 4, the 31st to 40th digits of π appear between Li and Be making the ‘‘mouthful’’ Chemical π 2019-03-14T04:00:00Z Information about the naturally occurring isotopes of elements with atomic numbers 1 through 10 is given in Table 2.4. Chemistry 2019-02-14T00:00:00Z That process would continue until the proton count dropped back to 172, providing a hard cap on the atomic number. A storied Russian lab is trying to push the periodic table past its limits—and uncover exotic new elements 2019-01-30T05:00:00Z These particles do not vary in quality from one element to another; rather, what gives an element its distinctive identification is the quantity of its protons, called its atomic number. Anatomy and Physiology 2013-06-19T00:00:00Z In the periodic table, each element has a chemical symbol, name, atomic number, and atomic mass. An Introduction to Geology 2017-01-01T00:00:00Z Today, there are 118 confirmed elements, neatly ordered according to atomic number — the number of protons found in the nucleus of each element. Anniversary celebrations are due for Mendeleev’s periodic table 2019-01-29T05:00:00Z Following hydrogen is the noble gas helium, which has an atomic number of 2. Chemistry 2019-02-14T00:00:00Z In the column where their atomic numbers say they should go or in a column with elements of similar properties? A storied Russian lab is trying to push the periodic table past its limits—and uncover exotic new elements 2019-01-30T05:00:00Z There are now more than 100 elements, laid out in order of increasing atomic number. Happy birthday, periodic table 2019-01-28T05:00:00Z The atomic number is the number of protons in the nucleus. An Introduction to Geology 2017-01-01T00:00:00Z In The Elements, the organizing principle was obvious: it was a beautiful catalogue of the building blocks of matter, ordered by atomic number and full of fascinating facts. Chemistry: Explosive moments in the laboratory : Nature : Nature Research 2017-10-10T04:00:00Z The next atom is the alkali metal lithium with an atomic number of 3. Chemistry 2019-02-14T00:00:00Z The heaviest element found in any appreciable amount in nature is uranium, atomic number 92. A storied Russian lab is trying to push the periodic table past its limits—and uncover exotic new elements 2019-01-30T05:00:00Z Thus, in the modern periodic table, the elements are arranged according to their atomic number - not their relative atomic mass. Happy birthday, periodic table 2019-01-28T05:00:00Z It's right up there on the periodic table of the elements - atomic number 15. Recovering phosphorus from sewage 2017-09-24T04:00:00Z For this step, he encoded the atomic numbers for five elements: hydrogen, carbon, nitrogen, oxygen and phosphorous, the building blocks of DNA. Greetings, E.T. (Please Don’t Murder Us.) 2017-06-28T04:00:00Z Figure 6.33 graphs the relationship between the first ionization energy and the atomic number of several elements. Chemistry 2019-02-14T00:00:00Z “It’s also a ‘golden number,’ since the number of protons in the nucleus of an atom of gold—the element’s so-called atomic number—is, you guessed it, seventy-nine.” A Mathematician Confronts March Madness 2017-03-15T04:00:00Z After the discovery of protons, scientists realised that the atomic number of an element is the same as the number of protons in its nucleus. Happy birthday, periodic table 2019-01-28T05:00:00Z Transuranic waste involves products contaminated with matter that has a higher atomic number than uranium. Project to clear radioactive waste completed at Idaho site 2017-03-03T05:00:00Z “We think that there are certain advantages with atomic number imaging,” Bewes says. Peek Inside Cat Mummies With New X-ray Images 2016-06-22T04:00:00Z Atoms with the same atomic number but different mass numbers are isotopes of the same element. Chemistry 2019-02-14T00:00:00Z Element 113 was first found in 2004, and the number refers to its atomic number, or the number of protons in the nucleus of the atom. First element discovered in Asia named 'nihonium', after Japan 2016-06-09T04:00:00Z Each number corresponds to the atomic number of an element. Crypto-challenge: the answers - BBC News 2016-04-03T04:00:00Z Chemists classify elements by the number of protons per atom, which they call atomic number. Four new elements complete the seventh row of the periodic table 2016-01-04T05:00:00Z With an atomic number of nine, fluorine sits between oxygen and neon on the periodic table but is much rarer than either. How neutrinos saved your teeth from cavities 2015-09-11T04:00:00Z The modern statement of this relationship, the periodic law, is as follows: the properties of the elements are periodic functions of their atomic numbers. Chemistry 2019-02-14T00:00:00Z Scientists say it took three minutes following the Big Bang, 13.7 billion years ago, for the first three elements to emerge — helium, hydrogen and then trace amounts of lithium, atomic number 3. ‘I Don’t Believe in God, but I Believe in Lithium’ 2015-06-25T04:00:00Z The periodic table is a tabular arrangement of the chemical elements, organised on the basis of their atomic numbers, electron configurations, and recurring chemical properties. Crypto-challenge: the answers - BBC News 2016-04-03T04:00:00Z It’s a radioactive element with an atomic number of 90—which makes it an elemental heavyweight—and in its most common form has a half-life of 14 billion years. Top Ten Insanely Great Science Terms 2014-03-13T19:42:20Z Rubidium is the chemical element of atomic number 37, a rare soft silvery reactive metal of the alkali metal group. And Let There Be "Molecules" of Light 2013-10-14T20:45:24.920Z Isotopes of an element are atoms with the same atomic number but different mass numbers; isotopes of an element, therefore, differ from each other only in the number of neutrons within the nucleus. Chemistry 2019-02-14T00:00:00Z The periodic system has two levels of classification: a primary level, based on atomic numbers of the elements, and a secondary one, based on chemical properties. Readers Respond to "Quantum Weirdness" 2013-09-21T11:15:00.690Z The study of superheavy atoms — which are unstable chemical elements with atomic numbers greater than 92 — help scientists better understand the basic forces that hold matter together. Made in Lab, Fleeting Element May Join Periodic Table 2013-08-28T00:34:51Z In high school the brothers studied optics and forces, the atomic numbers of the elements, the properties of light and sound. Jhumpa Lahiri: “Brotherly Love.” 2013-06-03T04:00:00Z An element's chemical identity is set by the number of protons in its nucleus—its atomic number. Japanese Physicists Claim Clinching Observation of New Superheavy Element 2012-09-26T21:26:49Z An atom of the alkaline earth metal beryllium, with an atomic number of 4, contains four protons in the nucleus and four electrons surrounding the nucleus. Chemistry 2019-02-14T00:00:00Z An element’s atomic number is the number of protons in its nucleus. Modern alchemy: Turning a line 2012-05-10T15:06:15Z The periodic table arranges the elements based on their atomic number and allows scientists to predict as-yet-undiscovered elements. Two Elements Join Periodic Table 2011-06-08T23:28:45Z An element's atomic number describes the number of protons in its nucleus. Two New Superheavy Chemical Elements Formally Recognized 2011-06-07T17:45:05.677Z All elements with an atomic number greater than uranium's 92 don't exist naturally on Earth and must be produced in nuclear reactors, nuclear explosions, or by using particle accelerators. Japanese Physicists Claim Clinching Observation of New Superheavy Element 2012-09-26T21:26:49Z Electron capture has the same effect on the nucleus as does positron emission: The atomic number is decreased by one and the mass number does not change. Chemistry 2019-02-14T00:00:00Z In this respect, Newlands anticipated the modern organization of the periodic table, which is based on the sequence of so-called atomic numbers. The Evolution of the Periodic System 2011-01-21T23:45:05.210Z They consist of a single type of atom distinguished by the number of protons in its nucleus, its atomic number. Two Elements Join Periodic Table 2011-06-08T23:28:45Z Elements are assigned an atomic number according to the number of protons — comparatively heavy particles with a positive electric charge — in their nuclei. Scientists Discover Heavy New Element 2010-04-06T19:44:00Z The number found in this way is one less than the atomic number. A Brief Account of Radio-activity Spent fuel rods contain a variety of products, consisting of unstable nuclei ranging in atomic number from 25 to 60, some transuranium elements, including plutonium and americium, and unreacted uranium isotopes. Chemistry 2019-02-14T00:00:00Z This fundamental quantity, first referred to as atomic number in 1920 by Ernest Rutherford, who was then at the University of Cambridge, is now identified as the number of protons in the nucleus. The Evolution of the Periodic System 2011-01-21T23:45:05.210Z Now let’s see what the atomic number tells us. Letters of a Radio-Engineer to His Son Various numbers of charge-free neutrons add to the nuclear mass of atoms but do not affect the atomic number. Scientists Discover Heavy New Element 2010-04-06T19:44:00Z So, by adding 1 to the number found the atomic number is obtained. A Brief Account of Radio-activity The first number would be the atomic number. Omnilingual After this discovery, chemists turned to using atomic number as the fundamental ordering principle for the periodic table, instead of atomic weight. The Evolution of the Periodic System 2011-01-21T23:45:05.210Z See also Decomposition, electrochemical Electro-chemical equivalents —— table of —— how ascertained —— always consistent —— same as chemical equivalents —— able to determine atomic number Electro-chemical excitation Electrode defined Electrodes affected by heat —— varied in size —— —— nature ——. Experimental Researches in Electricity, Volume 1 But that was enough to title the paper, which was reviewed by other scientists before acceptance, “Synthesis of a new element with atomic number Z=117.” Scientists Discover Heavy New Element 2010-04-06T19:44:00Z The atomic weight can usually be followed in fixing the atomic number, but where doubt exists the method just given can be resorted to. A Brief Account of Radio-activity |
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