An element has a electron configuration of 1s2 2s2 2p6 3s2. Upon forming an ion, its new configuration is 1s2 2s2 2p6. Which is the ion formed?

1 Answer
anor277
Mar 12, 2018

You should swiftly be able to identify the parent element....

Explanation:

...why? Because you got 12 electrons...and if there are 12 electrons, 12 negative charges, the NEUTRAL element must contain 12 positive charges...i.e. #Z_"atomic number"=12#...i.e. we gots #Mg#, the which commonly forms a #Mg^(2+)# ion as required for an alkaline earth....

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