Periodic TableHard

Question

The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na+ will be :-

Options

A.- 2.55 eV
B.- 5.1 eV
C.- 10.2 eV
D.+ 2.55 eV

Solution

Na+ + e- 
|I.E.| = |ᐃHe.g.| Hence
ᐃHe.g. of Na+ = - 5.1 eV

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