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

Correct option is C

The correct answer is (c) Chlorine.
The electronic configuration 2, 8, 7 corresponds to Chlorine (Cl). Chlorine is a non-metal and belongs to Group 17 of the periodic table, also known as the halogens. It has an atomic number of 17, which means it has 17 electrons. These electrons are distributed in three shells:
· 1st shell: 2 electrons
· 2nd shell: 8 electrons
· 3rd shell: 7 electrons
This configuration shows that chlorine has seven valence electrons, which makes it highly reactive as it tends to gain one electron to complete its outer shell.
Information Booster:
· Chlorine is a yellow-green gas at room temperature and is commonly used for water purification, disinfection, and in the manufacture of various products.
· It is highly reactive and forms compounds with many elements, most commonly forming chlorides, like sodium chloride (NaCl).
Explanation of Other Options:
· Hydrogen: Has an electronic configuration of 1 (only one electron).
· Helium: Has an electronic configuration of 2 (a complete shell with two electrons).
· Carbon: Has an electronic configuration of 2, 4 (with four electrons in its outer shell).