The noble gases are the least of any elements on the periodic table.

The
form acidic compounds with hydrogen.

The halogens are the most reactive among all the

No. an alpha particle is a pair of protons and a pair of neutrons, i.e. a helium

The closer the atoms are to becoming ionic the more highly dense the negatively charged side gets.

The molar mass of a substance is defined as the mass of 1 mol of that substance, expressed in grams per mole, and is equal to the mass of 6.022 × 10 23 atoms, molecules, or formula units of that substance.