![]() ![]() *Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu #Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No LrĬlick on the element to view its propertiesĮlement (sym) # Mass density oxid #'s mp bp EN Ionization Energy rad. One mole of a substance has the same mass in grams that one atom or molecule has in atomic mass units.The Periodic Table of the Elements H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac#. The numbers in the periodic table that we identified as the atomic masses of the atoms not only tell us the mass of one atom in u but also tell us the mass of 1 mol of atoms in grams. One mole of a substance has the same mass in grams that one atom or molecule has in atomic mass units. And whereas one sodium atom has an approximate mass of 23 u, 1 mol of Na atoms has an approximate mass of 23 grams. Whereas one hydrogen atom has a mass of approximately 1 u, 1 mol of H atoms has a mass of approximately 1 gram. The number in a mole, Avogadro’s number, is related to the relative sizes of the atomic mass unit and gram mass units. ![]()
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