The central atom's number of valence electrons in makes it an exception to the octet rule. nh3 sef2 bf3 asf3 cf4

Explanation:

You must draw the Lewis structure for each molecule, trying to give every atom an octet.

In the structures below, every molecule except one has a central atom with octet. That molecule is  

The B atom has only six electrons in its valence shell, so it violates the octet rule.

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

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