Answer
A- Sulphur
Work Step by Step
A- Sulfur is in group 16 and has 6 valance electrons and so does our element. Thus it is our answer.
B- Iodine is in group 17 and thus has 7 valance electrons in it's outer orbital but our element has 6
C-Aluminium is in group 13 and thus has 3 valance electrons in it's outer orbital but our element has 6
D- Phosphorous is in group 15 and thus has 5 valance electrons in it's outer orbital but our element has 6
E-Silicon is in group 14 and thus has 4 valance electrons in it's outer orbital but our element has 6