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2 solutions
I think iy eould be better of you mention to attain the electronic configuration of Argon.
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It is generally referred to as inert gas configuration.
But calcium is not an inert gas? I don't understand, I know the answer, but I am unable to understand "inert gas configuration". @Aryan Sanghi , I am mentioning you since you told you are preparing for JEE, so maybe you can help me, thanks!
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Also, I did not understand this question but don't want to report it.
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Check out the solution now Vinayak. Hope it will help. :)
See, Calcium ion exists as C a 2 + state because it Achieves noble gas configuration in that state, and noble gas configuration is quite stable. If you have doubt, take any compound of C a like C a C l 2 . It's charge is +2 in that state.
Configuration means electronic configuration , in simple words how are electrons distributed. Hope it helps.
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Oh, you mean its octet is complete when it becomes Ca 2 + ? If yes, I understand! Thanks a lot!
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@Vinayak Srivastava – Exactly, you did understood. :)
Calcium has Atomic Number 2 0
To achieve inert gas configuration, which in this case is 2 , 8 , 8 , It loses 2 electrons. Thus it's Charge is + 2