Chemistry - PERIODIC TABLE Question with Solution | TestHub

ChemistryPERIODIC TABLEAtomic Size, ZeffMedium2 minQB

ChemistryMediummultiple choice

If $σ$ value of ' Na ' is ' x ' then $Z_{eff.}$ value for ' Al ' will be :-

Answer:

B, D

Solution:

Na: $Z = 11$ , $S = x \to Z_{e ff} = Z - S = 11 - x$

Al: $Z = 13$ , 3 valence electrons $\to S = x + 0.70$ (screening of inner electrons + 0.35 for extra electrons)

Using Slater’s formula $\to Z_{e ff} = 13 - (x + 0.70) \approx 12.3 - x$

Stream:JEESubject:ChemistryTopic:PERIODIC TABLESubtopic:Atomic Size, Zeff

⏱ 2mℹ️ Source: QB

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