How many electrons does selenium gain in order to achieve anoble-gas configurati

Question

How many electrons does selenium gain in order to achieve anoble-gas configuration? How many electrons does francium give up in order to achieve anoble gas configuration???????? I don't understand how or what u need to achieve a noble gasconfiguration!!! Please help thanks How many electrons does selenium gain in order to achieve anoble-gas configuration? How many electrons does francium give up in order to achieve anoble gas configuration???????? I don't understand how or what u need to achieve a noble gasconfiguration!!! Please help thanks

Explanation / Answer

You have to see where the elements are located on the periodictable. Selenium's atomic number is 34. The nobel gasthat is closest to is Krypton, whose atomic number is 36. Selenium wants to be like Krypton, so it will have to gain 2electrons to get there. From 34 to 36, it will take 2electrons. For Francium (# 87), it wants to be like Radon (#86). It'sone number away from Radon, so it will give up 1 electron to becomeRadon. This is oversimplified, but I hope it helps.

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