Answer:
b) False
Step-by-step explanation:
CI is the element symbol of Chlorine with an atomic mass unit of 35.5 amu and atomic number 17.
That's why the given statement is false.
The elements of group 17 are called halogens. These are six elements Fluorine, Chlorine, Bromine, Iodine, Astatine.
Chlorine is present below the bromine and have following properties:
Properties of Chlorine:
1. it is greenish-yellow irritating gas.
2. its melting point is 172.2 K
3. its boiling point is 238.6 K
4. it is disinfectant and can kill the bacteria.
5. it is also used in manufacturing of paper, paints and textile industries