Answers

2016-02-27T12:13:06+05:30
It is according to the 2n² rule the maximum number of electrons in the third period should be 2*3²=18 But the last shell cannot accomodate more than 8 electrons.Therefore the number of electrons in the third period is 8
1 4 1
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2016-02-27T17:35:48+05:30
It's according to the 2n square rule... where n=no. of shells
1 2 1