Elements from which of the following sections of the periodic table have the highest ionization energies?

W) Periods 2 and 3 of Group 1

X) Periods 2 and 3 of Group 17

Y) Periods 5 and 6 of Group 17

Z) Periods 6 and 7 of Group 1
X) PERIODS 2 AND 3 OF GROUP 17