Question

Classify the species into different iso-electronic pairs: Ti 2+, Ne, K+, Na+, P 3-,

Ca * Ne and K+, Na+ and P 3-, Ti 2+ and Ca Ne and Na+, K+ and P 3-, Ti 2+ and Ca Ne and P 3-, K+ and Ca, Na+ and Ti 2+?
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Answer 1

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.

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