First, how plenty of electrons walk calcium have? It"s atom number is 20; this way that it has 20 protons and 20 electrons.

You are watching: What is the electron configuration of the calcium ion?

By abbreviated, one presume that us would start with the vault noble case. In the instance of calcium, that would be argon.

So Calcium"s abbreviation electron framework would be 4s2 (because it is in the 2nd column and on the 4th row). As Calcium is a metal, it loser electrons to end up being an ion. So it would lose the 2 electrons. That would certainly make its abbreviated electron structure just . The calcium ion has 18 electrons so the is isoelectronic through Argon.

We would do something similar with Sulfur. Sulfur has 16 electron - therefore its framework would it is in 3s2 3p6; the would gain 2 electrons to become an ion (non-metals gain), therefore its ion framework would it is in 3s2 3p8 and also that makes it additionally isoelectronic with Argon.

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