At the top of the candle solid wax changes into liquid wax what is the name of the process

Melting

Explanation:

solid to liquid

and freezing is when liquid changes back to solid

but candle wax doesn't freeze, it evaporates. The gaseous wax burns in oxygen to produce water, carbon dioxide, heat and light. The burning candle also produces carbon, in the form of the black soot we see on the spoon.

it means there are 3 atoms of oxygen