How many core electrons are in a chlorine atom?

Name: How many core electrons are in a chlorine atom?
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Question

Quizplus · Accepted Answer

The number of core electrons in an atom is equal to the number of electrons in the closed inner shells. The electron configuration of chlorine is 1s²2s²2p⁶3s²3p⁵. The innermost shell (1s) contains 2 electrons, the second shell (2s and 2p) contains 8 electrons, and the third shell (3s and 3p) contains 7 electrons. Therefore, there are a total of 10 core electrons in a chlorine atom.

How Many Core Electrons Are in a Chlorine Atom