a lot of people asked why the electronic configuration of calcium is 2,8,8,2 and not 2,8,9,1, and people answer that the third level can only hold 8 electrons, but i thought it could hold 18. i've seen an exclamation somewhere but i didn't understand it. can someone simplify it for me?
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The first energy shell is an atom is a duplet, that means it can hold 2 electrons
All the shells after that are octets and can hold upto a certain number of electrons. That number is 8.
So, that means that the first energy shell of every element will contain upto 2 electrons while all the shells after the duplet can hold upto 8 electrons.
This is why the electronic configuration of Calcium is 2, 8, 8, 2 and not 2, 8, 9, 1
carmelsabari:
then why do they say that that it goes 2,8,18,32?
2, 8, 18, 32? No! You have got the wrong idea
It never goes like 2, 8, 18, 32
always 2, 8, 8, 8, 8... etc
hm... ok, i guess i wasn't listening well enough
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