Both the 13th and the 3rd group have 3 electrons in their outermost shell. The answer given is option A whereas the option B also suits to the condition given in the question. Please clarify.

Asked by Akshai R K | 23rd Feb, 2014, 12:15: AM

Expert Answer:

The element given has electronic configuration 2, 8, 18, 3 and has 3 electrons in the outermost shell.
So the atomic number of the element is 31 and  the given element belongs to 13th group.

Answered by  | 25th Feb, 2014, 10:14: AM

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