What is the electron configuration of an element with atomic number 20?

asked Jan 13, 2018 86.4k views

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7 votes

Answer: D

Explanation: The correct answer is option D for Plato users

Paul Rene answered Jan 15, 2018

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if the atomic number is 20, this means the element is Calcium (Ca).

the electron configuration of Ca is:

[Ca]=
1s^22s^22p^63s^23p^64s^2

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