The main component of apatite family is phosphorus. Order of IE1 of group 15 elements N>P>As>Sb IE of phosphorus =1012 kJ mol−1.
JEE Main 2025 — Chemistry Inorganic Chemistry
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 :
Held on 29 Jan 2025 · Verified 6 Jul 2026.
1402 kJ mol−1
834 kJ mol−1
1012 kJ mol−1
947 kJ mol−1
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