Question

Find the screening effect for 37 Rb ​

Answer 1

Explanation:

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Answer 2

$\underline{\red{\rm Screening \ Effect \ :- }}$

• The inner shell electrons protect the nuclear charge to reach the outer shell electrons which is known as Sheilding Effect.
• Order - s > p > d > f

$\boxed{\sf Z_{eff}= Atomic\ Number - \sigma }$

$\bf Rules\ for \ \sigma :-$

• For ns and np , for last electron , σ = 0 .
• For rest np and ns e , σ = 0.35 / electron.
• For ( n-1) th shell , σ = 0.85 / electron .
• For (n-2) shell onwards , σ = 1/electron.

$\bf Hence \ for \ _{37} Rb :-$

$\to\sf Rb = 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6 5s^1$

Hence ,

$\sf\longrightarrow \sigma = 0 + 8(0.85) + (28)(1) \\\\\sf\longrightarrow \sigma = 34.8 \\\\\sf\longrightarrow Z_{eff}= 37 - 34.8 \\\\\sf\longrightarrow \underline{\boxed{\sf Z_{eff}= 2.2 }}$