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The electronic configuration of an atom having atomic number ‘20’ is
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- 2, 8, 10
- 2, 6, 8, 4
- 2, 8, 8, 2
- 2, 10, 8
- 2, 8, 10
Correct Option: C
Electrons occupy shells around the outside of an atom. There can be up to two electrons in the first shell, up to eight in the second and up to eight in the third. A calcium atom (Ca) has electron structure 2,8,8,2.
