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Classification of Elements and Periodicity in Properties

Effective nuclear charge

Effective nuclear charge ({Z}_{ {eff }}) is the net attractive

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Solving time: 3 mins

Effective nuclear charge $(Z_{eff})$ is the net attractive force on electrons under Consideration and is equal to: $Z_{eff} = Z - σ$ (nuclear charge $-$ screening constant). $Z_{eff}$ or $σ$ is calculated by Slater's formula, as given. If one electron is present in the outermost orbit, there will be no screening in that orbital. Each electron contribute, $0.35$ (total electrons minus one electron) present in the outermost shell. A contribution of $0.85$ for each electron is taken in the (n-1)th shell. For all other electrons contribution is 1 for each electron. The screening constant $(σ)$ for $4 s$ electron of $Mn$ ( $Z = 25)$ will be :

18.00

4.25

18.35

21.40

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Book:

Inorganic Chemistry for IIT JEE Main and Advanced (McGraw Hill)

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Theodore Discussed

Effective nuclear charge

(Z_{eff})

is the net attractive force on electrons under Consideration and is equal to:

Z_{eff} = Z - σ

(nuclear charge

-

screening constant).

Z_{eff}

σ

is calculated by Slater's formula, as given. If one electron is present in the outermost orbit, there will be no screening in that orbital. Each electron contribute,

0.35

(total electrons minus one electron) present in the outermost shell. A contribution of

0.85

for each electron is taken in the (n-1)th shell. For all other electrons contribution is 1 for each electron. The screening constant

(σ)

for

4 s

electron of

Mn

(

Z = 25)

will be :

14 mins ago

Discuss this question LIVE

14 mins ago

Text solutionVerified

(d)

σ = 1 \times 0.35 + 13 \times 0.85 + 10 \times 1 = 21.40

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Question Text	Effective nuclear charge $(Z_{eff})$ is the net attractive force on electrons under Consideration and is equal to: $Z_{eff} = Z - σ$ (nuclear charge $-$ screening constant). $Z_{eff}$ or $σ$ is calculated by Slater's formula, as given. If one electron is present in the outermost orbit, there will be no screening in that orbital. Each electron contribute, $0.35$ (total electrons minus one electron) present in the outermost shell. A contribution of $0.85$ for each electron is taken in the (n-1)th shell. For all other electrons contribution is 1 for each electron. The screening constant $(σ)$ for $4 s$ electron of $Mn$ ( $Z = 25)$ will be :
Topic	Classification of Elements and Periodicity in Properties
Subject	Chemistry
Class	Class 11
Answer Type	Text solution:1
Upvotes	71

Text solutionVerified

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