MCQ
What will be the order of Ist ionisation energy
- ✓$Li > Na > K$
- B$K > Li > Na$
- C$Na > Li > K$
- D$Li > K > Na$
✓
Answer
Correct option: A.
$Li > Na > K$
a
(a) In a group, the ionisation potential decreases from top to bottom. In the alkali group, the ionisation potential decreases from $Li$ to $Cs$
(a) In a group, the ionisation potential decreases from top to bottom. In the alkali group, the ionisation potential decreases from $Li$ to $Cs$
$ Li$ $Na$ $K$ $Rb$ $cs$
$eV $ $5.3$ $5.1$ $4.3$ $4.2$ $3.9$
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