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Calculate the Effective nuclear charge o...

Calculate the Effective nuclear charge of helium.

Text Solution

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`Z_("eff")=Z-S`
`Z_("eff")=2-0.30("for" 1se^(-)=0.30)`
`Z_("eff")=1.70`
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Knowledge Check

  • Assertion : Na^(+) and Al^(-3) are isoelectronic but the magnitude of the ionic radius of Al^(+3) is less than that of Na^(+) . Reason : The magnitude of effective nuclear charge of the outer shell of electrons of Al^(+3) is greater than that of Na^(+)

    A
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    B
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    C
    if assertion is true, but reason is false
    D
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  • Ionic radii vary in : (1) inversely proportional to the effective nuclear charge ( 2) inversely proportional to the square of the effective nuclear charge. ( 3) direct proportion to the screening effect. (4) direct proportion to the square of screening effect. Choose the correct statements :

    A
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    B
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    C
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    D
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