Aluminum and chlorine electro dot formula

Refer attached figure.

The electron dot structure (Lewis structure) represents the number of valence electrons of an element in terms of dots around the symbol of the element.

Number of dots = Number of valence electrons

1. Aluminum:

Symbol = Al

Atomic number = 13

Main Group number = IIIA (3A) of the periodic table.

Group = Group 13 of periodic table

Number of valence electrons = Main group number = 3

Electron dot structure = (See attached figure)

2. Chlorine

Symbol = Cl

Atomic number = 17

Main group number = VIA (7A) of the periodic table.

Group = Group 17 of periodic table

Number of valence electrons = Main group number = 7

Electron dot structure = (See attached figure)