Establish the relationship between atomci number, mass number, isotopes, isobars and valency of an atoms.
Atomic number — Gives the number of protons (Z) Mass number — Gives the number of protons and neutrons (A) Isotopes — When atoms of the same element have the same number of protons (Z) but the different number of neutrons (s) such atoms are called isotopes. Isobars — When atoms of the different elements have the same mass number (A) but the different atomic number (Z) such atoms are called isobars. Valency — It is the combining capacity of an atom. Hence, both are isotopes of C. Isobars are elements having the same mass number but different atomic number 4020Ca 4018Ar.
