Question

diffrence between atomic weight and atomic number

Answer 1

The atomic mass of an element is the average relative mass of an atom of the element as compared with the mass of C12 atom taken as 12 units Eg: Sodium has 23 amu
while
atomic number of an element is the electronic configuration of the element eg: sodium atomic no. is 11 which is written as
K L M. shells
2 8 1

Answer 2

Atomic number is the number of protons in an atom.

Atomic weight is the sum of number of protons and number of neutrons in an atom.