Question

11. Isoelectronic species are those which have the same number of electrons. Among the given species identify the isoelectronic pairs. (a) F & Na (b) Mg & Al+3 (c) Ne & K+ (d) Ar & CH​

Answer 1

Answer:

Na⇒1s

2

,2s

2

2p

6

,3s

1

Na

+

⇒1s

2

,2s

2

2p

6

similarly for Mg

2+

⇒1s

2

,2s

2

2p

6

Na

+

,Mg

2+

, are isoelectronic species. They contain 10 electrons each.

S

2−

⇒1s

2

,2s

2

2p

6

,3s

2

3p

6

Ar⇒1s

2

,2s

2

2p

6

,3s

2

3p

6

K

+

⇒1s

2

,2s

2

2p

6

,3s

2

3p

6

Ca

2+

⇒1s

2

,2s

2

2p

6

,3s

2

3p

6

Ar,S

2−

,Ca

2+

andK

+

are isoelectronic species. They contain 18 electrons each.