[" 8.Are mass number and atomic mass of an element equal in all respects? "],[" 9.What are ions? What are its two types? "]

Are mass number and atomic number of an element same in all respects ?

What is atomic mass of an element?

What is mass number of an atom?

The mass number and atomic number of an element are A and Z respectively. The number of neutrons in the atom of that element is calculated as___.

If the mass number of an atom of an element decreases by 4 and atomic number decreases by two then it is