The first ionization potential in electron volts of nitrogen and oxygen atoms are respectively given by

Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se, and Ar?

Amongst the following elements (whose electronic configurations are given below), the one having the highest ionization energy is

Which of the following has the maximum number of unpaired electrons?

The set representing the correct order of first ionization potential is

The five successive ionization energies of an element are 800, 2427, 3658, 25024 and 32824 ${\text{kJ mol}}^{-1}\backslash text\{kJ\; mol\}^\{-1\}$respectively. The number of valence electrons is

The second ionization energies of Li, Be, B and C are in the order

Ionisation energies of the following elements increases in the order

Which of the following processes involves absorption of energy?

The correct order of electron gain enthalpy with negative sign of F, Cl, Br, and I, having atomic number 9, 17, 35, and 53 respectively is