On moving down the group 14, the ionization enthalpy
A. increases slightly from Si to Sn and decreases slightly from Sn to Pb
B. increases throughout uniformly from Si to Pb
C. decreases throughout uniformly from Si to Pb
D. decreases slightly from Si to Sn and increases slightly from Sn to Pb
Answer:D
On moving down the group 14, the ionization enthalpy
A. increases slightly from Si to Sn and decreases slightly from Sn to Pb B. increases throughout uniformly from Si to Pb C. decreases throughout uniformly from Si to Pb D. decreases slightly from Si to Sn and increases slightly from Sn to Pb