How do you write the electron configuration for calcium?

1 Answer
anor277
Feb 23, 2017

Got a Periodic Table.............? Of course, you have, you are doing your chemistry homework.

Explanation:

For #Ca#, #Z=20#. And thus for the neutral atom, we have 20 electrons to distribute:

#1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)#

How do we write the configuration for #Ca^(2+)?#

And the abridged form is #[Ar]4s^2..............#

What about #"potassium"#, and what about for #"chlorine"#?

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