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Question
What is the electronic configuration of third element of group-2 in periodic table?
Options
[Ne] 3s2
[Ar] 4s2
[Ne] 3s1
[Ar] 4s1
MCQ
Solution
[Ar] 4s2
Explanation:
\[\ce{Ca20 -> [Ar] 4s^2}\]
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Alkali Metals and Alkaline Earth Metals
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