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

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Magnesium

Strontium

Calcium

All of the above

answer is D.

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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.

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