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:

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Strategy:
 Identify the element in the "apatite family" (calcium phosphates) and select its characteristic ionization enthalpy.

Step 1: Identification
Apatite minerals are primarily based on Phosphorus (P).
Group 15 elements: .
-  trend: .

The value for Phosphorus is .

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