The first ionisation potential of Na, Mg and Si are 496, 737, and 776 kJmol−1 respectively. The ionisation potential of Al could be:
A
760kJmol−1
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
575kJmol−1
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
801kJmol−1
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
419kJmol−1
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is B575kJmol−1 Ionisation potential increases when we move from left to right in a period. But the ionisation enthalpy of Al is lower than that of Mg as the 3p1 electron of Al is easier to remove than to remove an electron from a fully-filled 3s-orbital of Mg.