Study point

Atomic Masses 1A 2A 3A 4A 5A 6A 7A 8A (1) (2) (13) (14) (15) (16) (17) (18) 3B 4B 5B 6B 7B — 8B — 1B 2B (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) 1 H He 2 Li Be B C N O F Ne 3 Na Mg Al Si P S Cl Ar 4 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr 5 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe 6 Cs Ba La   Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn 7 Fr Ra Ac   Rf Db Sg Bh Hs Mt Ds Rg Uub — Uuq — — — — 6   Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu 7   Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr   The  atomic mass  of an element is the average mass of the atoms of an element measured in  atomic mass unit  (amu, also known as  daltons , D).  The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope.  (Atomic mass is also referred to as  atomic weight , but the term "mass" is more accurate.) For instance, it can be determined experimentally that neon consists