What do you understand by the term ‘mass number’?
Mass number is the combined number of protons and neutrons in an atom. It is denoted by the ‘A’.
Example: In C612 there are 6 protons and 6 neutrons, thus its mass number = 6+6 = 12.
What do you understand by the term ‘atomic number’?
What do you understand by the term “atomic number of carbon is 6”?
What do you understand by the term that atomic mass of calcium is 40?
What do you understand by Atomic number and Mass number?
What do you understand by term valency?