1.

The shield effect of electron decreases in the order

Answer»

`f GT d gt p gt s`
`s gt p gt d gt f `
`s gt d gt p gt f `
`p gt d gt s gt f `

Solution :We know that, shielding EFFECT of orbitals depends upon shape of orbitals. F-orbitals has diffused shape, HENCE f-orbitals has poor shielding effect. It decreases in th ORDER,
`s gt p gtd gt 4f gt 5t.`


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