Define the element whose atom has: a) three electronic levels and four electrons on the outer level

Define the element whose atom has:
a) three electronic levels and four electrons on the outer level;
b) two electronic levels and seven electrons at the outer level.

The number of electronic levels is equal to the number of the period in which the element is located. The number of electrons at the outer level is equal to the number of the group in which the element is located.
a) the element is in the 3rd period of the IV group – this is Si b) the element is in the 2nd period of the VII group – this is F.