Consider the following thermodynamic data:

Reaction    ∆H˚  Reaction    ∆H˚      

Ca(s) ¬¬¬¬––––> Ca(g) 178 kJ/mol K(s) ¬¬¬¬––––> K(g) 89.2 kJ/mol
Ca(g) ––––> Ca1+(g) 596 kJ/mol K(g) ––––> K+(g) 425.1 kJ/mol
Ca+(g) ––––> Ca2+(g) 1152 kJ/mol K+(g) ––––> K2+(g) 3057.6 kJ/mol

F2(g) ––––> 2F(g) 158 kJ/mol Cl2(g) ––––> 2Cl(g) 242.6 kJ/mol
F(g) ––––> F–(g) -350 kJ/mol Cl(g) ––––> Cl–(g) -349.0 kJ/mol

1. Which of the two metals is easier to sublime?