the electron configuration of the atom with the atomic number 39 20 39 | Examsbook

237

Q:
The electron configuration of the atom with the atomic number '20' is?

1
2, 8, 10
2
2, 6, 8, 4
3
2, 8, 8, 2
4
2, 10, 8

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Answer : 3. "2, 8, 8, 2"
Explanation :
The electronic configuration of the element with atomic number 20 is 2, 8, 8, 2.
The element with an atomic number of 20 is Calcium, Ca.
The electron configuration is found using the Aufbau principle: 1s², 2s², 2p⁶, 3s², 3p⁶, 4s²
It belongs to the 2nd group and 4th period.

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