The first ionisation enthalpies of the lanthanoids are around (A)______, the second about (B)______ comparable with those of (C)_____ here, A,B and C refers to

Options

A. A-600 kJ/mol, B-1200kJ/mol,C-calcium
B. A-1200 kJ/mol, B-600kJ/mol, C-strontium
C. A-1200 kJ/mol, B-600 kJ/mol, C-lanthanum
D. A-600 kJ/mol, B-1200kJ/mol, C-lutetium

Answer

A

Explanation

The first ionisation enthalpies of the lanthanoids are around 600 kJ/mol, the second about 1200 kJ/mol comparable with those of calcium.