Question

Help Me Out! 1. How to calculate Atomic Mass of an element? 2. How to calculate Mass Number of an element?

Answer 1

The atomic mass is defined as the mass of an atom, which can only be one isotope at a time and is not an abundance-weighted average as in the case of atomic weight.
The mass number (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus.It is given in the periodic table ..
For details check these out:
http://en.wikipedia.org/wiki/Mass_number
http://en.wikipedia.org/wiki/Atomic_mass

Answer 2

atomic mass means the summation of mass of each constituents of the atom.and mass number is the summation of number of proton and number of neutron..therefore atomic mass is fractional quantity and mass number is integer quantity...