Aluminum (al) has three valence electrons and a total of three subshells. without using the periodic table, in which group and period is aluminum located?
a) group 3b, period 6
b) group 1a, period 1
c) group 6a, period 3
d) group 3a, period 3
*i chose d *

Option (D) is the correct answer.

Explanation:

Atomic number of aluminium is 13 and its electronic configuration is . As here n = 3 this means that aluminium element belongs to period.

Since, it contains 3 unpaired electrons. Therefore, in order to attain stability it will readily lose its valence electrons and hence, acquires as charge of +3.

This means that aluminium element belongs to group 3A and period 3.  As it is a p-block element.

Thus, we can conclude that aluminium is located in Group 3A, Period 3.