Section AQuestion 1(a)
1 mark
The first ionisation energies of four successive elements in the Periodic Table are:
P = 1251, Q = 1521, R = 419, S = 590 kJ mol−1.
Which element has atoms with a full outer shell of electrons?
P = 1251, Q = 1521, R = 419, S = 590 kJ mol−1.
Which element has atoms with a full outer shell of electrons?