Which of the following is the electronic configuration of an alkali earth metal of 3rd period?
Answer: [Ne] 3s²
Explanation
Alkaline earth metals: These elements have two valence electrons in their outermost s orbital.
3rd period: In the third period, the outermost shell is the 3rd shell.
Therefore, the electronic configuration of an alkaline earth metal in the 3rd period is [Ne] 3s².
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