![]() ![]() Suppose that we have N N carbon atoms, where N N is a number large enough to give us a pile of carbon atoms whose mass is 12.0 grams. There you can find the metals, semi-conductor(s), non-metal(s), inert noble gas(ses), Halogens, Lanthanoides, Actinoids (rare earth elements) and transition metals. For elements with no stable isotopes, the mass number of the isotope with the longest half-life is in parentheses. Molar Masses of the Elements ELEMENT CHEMICAL ATOMIC MOLAR ELEMENT CHEMICAL ATOMIC MOLAR NAME SYMBOL NUMBER MASS NAME SYMBOL NUMBER MASS Actinium Ac 89 (227) Mendelevium Md 101 (258) Aluminum Al 13 26.982 Meitnerium Mt 109 (266) Americium Am 95 (243) Mercury Hg 80 200.59 Antimony Sb 51 121. 16 u × 1.6605 ×1024 g 1 u 2.66 ×1023 g (per oxygen atom) 16 u × 1.6605 × 10 24 g 1 u 2.66 × 10 23 g (per oxygen atom) Example 2.9.3 2.9. Please note that the elements do not show their natural relation towards each other as in the Periodic system. The unity for atomic mass is gram per mol. The lightest chemical element is Hydrogen and the heaviest is Hassium. ![]() The chemical elements ofįor chemistry students and teachers: The tabular chart on the right is arranged by Atomic mass (weight). ![]() This list contains the 118 elements of chemistry.
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