[MP PMT 1985]
A) Lower electronegativity
B) Higher ionization potential
C) Greater atomic radius
D) Lower melting point
Correct Answer: B
| Element | Na | K |
|---|---|---|
| $ IE_1 $ | 496 | 419 |
| $ IE_2 $ | 4562 | 3051 |
Sodium has higher I.E. because of smaller atomic size.
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