Chlorine (cl) is in group 17. this

a does not react with other elements
b has 17 electron shells
c forms a salt when combined with a metal
d has 17 electrons

option d = has 17 electrons

Explanation:

Chlorine is present in 17 group which is called halogens. These are six elements Fluorine, Chlorine, Bromine, Iodine, Astatine. Halogens are very reactive these elements can not be found free in nature. Their chemical properties are resemble greatly with each other. As we move down the group in periodic table size of halogens increases that's way fluorine is smaller in size as compared to other halogens elements.

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.

6. It consist of seventeen electrons. The two electrons are present in shell one, eight electrons are present in second shell and seven electrons are present in third shell.

Electronic configuration:

1s² 2s² 2p⁶ 3s² 3p⁵

It is highly reactive, and present in combined form in nature with other elements. Its out most shell consist of seven electrons and to complete the octet it accept the one electron from other elements and becomes stable.