How do you write the electron configuration for calcium?

1 Answer
Feb 23, 2017

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

Explanation:

For CaCa, Z=20Z=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)1s22s22p63s23p64s2

How do we write the configuration for Ca^(2+)?Ca2+?

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

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