Answer is:
1. silicon.
2. lead.
5. iodine.
Silicon (symbol: Si) is an element with atomic number 14 (14 protons).
Lead (Pb) is an element with atomic number 82.
Iodine (I) is an element with atomic number 53.
Silicone is a compound (polymer) made of silicon, oxygen, hydrogen, carbon and other elements.
Quartz is a compound (mineral) made of silicon and oxygen atoms.