Correct Answer: Option E

Explanation

You can determine the group of an element by the number of electrons of their outermost shell.

Hence; this element silicon belongs to group 5 OR The Group to which an element belongs to, can be identified by adding the number of electrons of the orbital with the highest principal quantum number, in this case, 3s2 and 3p3. Therefore, 2+3 is equal to 5

note; if the highest principal quantum number is just 3s2 for example then the element belong to group 2. 

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