Question

Define:- Atomic mass, Molecular mass, Valency, Mole concept, Atomicity

Answer 1

the mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.

Answer 2

ATOMIC MASS: Mass of an atom of an element which is expressed in atomic mass units. It is the approximate sum of no. of protons and neutrons. MOLECULAR MASS: It is the mass of molecule. It is usually obtained relative to the mass of isotope carbon 12. VALENCY: It is the combining capacity. The no. of electrons gained, lost or shared by the atom of an element so as to attain stability. MOLE CONCEPT: A mole is defined as the quantity of substance which contains the same number of elementary particles or chemical units as the number of atoms present in 12 grams of C-12 isotope. ATOMICITY: The number of atoms in the molecule of an element.