Name the element which has an electronic configuration of 2, 8, 7.

Question

Question

This question was previously asked in

NTPC CBT-I (Held On: 7 Jan 2021 Shift 1)

Answer 1

The correct answer is Chlorine.

Key Points

The element having electronic configuration 2,8,7 is Chlorine.
It is the member of group 17. It is a p - block element which means the valence shell containing the valence shell electrons in the p subshell.
The systematic way of writing the configuration is 1s2, 2s2 2p6, 3s2 3p5. so the last 5 electrons are filled in p subshell.
Chlorine is a chemical element with the symbol Cl and atomic number 17.
The second-lightest of the halogens, it appears between fluorine and bromine in the periodic table and its properties are mostly intermediate between them.
Chlorine is a yellow-green gas at room temperature.

Additional Information

Chlorine has a variety of uses:
- It is used to disinfect water and is part of the sanitation process for sewage and industrial waste.
- During the production of paper and cloth, chlorine is used as a bleaching agent.
- It is also used in cleaning products, including household bleach which is chlorine dissolved in water.