Question

The fourth and fifth periods have __________ elements, are called __________ periods.

Answer 1

Explanation:

CCl4

Carbon tetrachloride/Formula

Carbon tetrachloride, also known by many other names (such as tetrachloromethane, also recognised by the IUPAC, carbon tet in the cleaning industry, Halon-104 in firefighting, and Refrigerant-10 in HVACR) is an organic compound with the chemical formula CCl4.

Answer 2

Answer:

18 element

first period