Which of the following element(s) has/have two electrons in its outermost shell?

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away

An Intiative by Sri Chaitanya

Magnesium

Strontium

Calcium

All of the above

answer is D.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

Magnesium, Strontium, and Calcium are the elements which have two electrons in its outermost shell.
Alkaline earth metals are those elements that have two electrons in their outermost orbit. Magnesium (Mg), strontium (Sr), calcium (Ca) have the atomic number 12, 38 and 20 respectively. The electronic configuration of calcium is 2,8,8,2. The electronic configuration of magnesium is 2,8,2. The electronic configuration of strontium is 2,8,18,8,2. Two electrons present in the outermost shell of each of these elements.
The electrons located in this outermost shell are referred to as valence electrons, and this shell is known as the valence shell.

Watch 3-min video & get full concept clarity

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Online Course for IIT JEE

Best Online Course for NEET

Best Online Course for CBSE