Question

Why is the atomic mass of silver not twice as of it's atomic number?
(Since , atomic number is number of protons in an atom and atomic mass is the sum of number of Neutrons and Protons. Obviously , the number of protons and neutrons in an atom is the same. Example , oxygen has an atomic number of 8 and it's atomic mass is 16 , exactly the twice.))

Answer 1

Answer:

It usually is because the atomic number describes how many protons there are in an atom's nucleus and the atomic mass is the total mass of all protons, neutrons and electrons. However, the mass of an electron is so small as to be relatively insignificant.