Easy question?
the answer i think is group 13...but WHY??
Answer:
because u think so, therefor it is correct.
:-)
now seriously, there are lots of ways to do this. simplest would be to see that element N5 (3+2 electrons=5) Boron, is in group 13. u can argue as well, that since the 1s and 2s electron shell are full, the next to be filled in is 2p, so therefor the element cannot be in group 3-12, for they are all d-elements.
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