I need help with chem please!! Number 8

What elements have 2 electrons inthe 4s sublevel

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.

Agas can holds 2.0 gal of gasoline. what is this quantity in cubic centimeters?