![]() The original periodic table of the elements published by Dimitri Mendeleev in 1869 arranged the elements that were known at the time in order of increasing atomic weight, since this was prior to. In Chapter 1, we described Dalton’s theory that each chemical compound has a particular combination of atoms and that the ratios of the numbers of atoms of the elements present are usually small whole numbers. One molecule of water (H 2 O) would weigh 18.02 amu (2×1.00797 amu for H + 15.9994 amu for O), and a mole of water molecules would weigh 18.02 grams. By definition, 1 mol S 6.02 × 1023 atoms S, and the molar mass from the periodic. (8 atoms)(15.9994 amu/atom) = 127.9952 amuįormula mass of Ca 3(PO 4) = 310.177 2amu We begin by finding the atomic mass of each element in the periodic table. Deuterium and Tritium are both used as fuel in nuclear fusion reactors. Hydrogen is the only element whose isotopes have been given different names. ![]() \right ) \right ]=310.177\ amu \notag \) Atoms The ordinary isotope of hydrogen, H, is known as Protium, the other two isotopes are Deuterium (a proton and a neutron) and Tritium (a protron and two neutrons).
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