![]() ![]() No element has an atomic weight less than one. Electron configuration The arrangements of electrons above the last (closed shell) noble gas. Atomic number The number of protons in an atom. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. One atomic mass unit isĭefined as 1/12 the mass of an atom of carbon-12. Element Lithium (Li), Group 1, Atomic Number 3, s-block, Mass 6.94. The number in parentheses is the mass number of the most stable or best-known isotope of that element.Ītomic weights are measured in atomic mass units. These elements are unstable that is, their nuclei decompose radioactively. ![]() The atomic weight of some elements is given as a whole number enclosed in parentheses. Name: chlorine Symbol: Cl Atomic number: 17 Atomic weight: 35.45 State: gas Group, period, block: 17, 3, p Color: pale yellow-green gas Classification: halogen Electron configuration: 3s2 3p5. That 75.53% of naturally occurring chlorine is chlorine-35 and 24.47% is chlorine-37. Chlorine was discovered by a Swedish scientist, Carl Willam Scheele in 1774. The atomic weight of chlorine (35.45) reflects the fact The atomic weight of carbon (12.01) reflects the relative abundance of The atomic weight of an element is based on the variety of naturally occurring isotopes of that element and the relative abundance of each.Ī collection of naturally occurring carbon atoms contains 98.89% carbon-12Ītoms and 1.11% carbon-13 atoms, along with a trace percentage of carbon-14Ītoms. Both the periodic table and the alphabetical list of the elements show the atomic weights of the elements. The atomic weight (or atomic mass) of an element is the average relative mass of the naturally occurring atoms of that element. ![]()
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