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Explain briefly how +2 states becomes mo...

Explain briefly how +2 states becomes more and more stable in the first half of the first row transition elements with increasing atomic number.

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`""_(21)SC " "_(22)Ti" "_(23)V" """_(24)Cr" "_(25)Mn`
Sc(Z=21) `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)3d^(1)`
`Sc^(2+) [Ar] 3d^(1) Cr^(2+) [Ar] 4s^(1)3d^(1)`
`Ti^(2+) [Ar] 3d^(2) Mn^(2+) [Ar] 3d^(5)`
`V^(2+)[Ar]3d^(3)`
With the increase in the atomic number, the d-orbital becomes half filled and they becomes more stable.
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