If an element a is heavier than element b,
a) element a must have more particles in the nucleus than element b.
b) element a must have a higher melting point than element b.
c) element a must be a metal.
d) then element a must be on the right side of the periodic table.

C

Explanation:

because non metals mostly exist in gaseous and liquid state and since element A is heavier hence its a metal

chemists can use the electron cloud model to assign electrons to different atomic orbitals. atomic orbitals also explain the patterns in the periodic table

explanation: