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Electronic configuration of calcium atom can be written as

1. [Ne] 4p2
2. [Ar] 4s2
3. [Ne] 4s2
4. [Kr] 4p2

Correct answer: [Ar] 4s2

Solution

Calcium (atomic number 20) has the electronic configuration 1s2 2s2 2p6 3s2 3p6 4s2, which can be abbreviated as [Ar] 4s2.

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