First ionisation enthalpy values of first four group 15 elements are given below. Choose the correct value for the element that is a main component of apatite family :

Group 15 elements are: N, P, As, Sb, Bi.

Apatite is a mineral with the formula $$Ca_5(PO_4)_3(F,Cl,OH)$$. The main component element from Group 15 in apatite is phosphorus (P).

The first ionization enthalpies of Group 15 elements:

N: 1402 kJ/mol, P: 1012 kJ/mol, As: 947 kJ/mol, Sb: 834 kJ/mol

Phosphorus has a first ionization enthalpy of 1012 kJ/mol.

The correct answer is Option 3: 1012 kJ mol⁻¹.

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