Chemistry - PERIODIC TABLE Question with Solution | TestHub

ChemistryPERIODIC TABLEAtomic Size, ZeffMedium2 minQB

ChemistryMediuminteger

Find the $Z_{eff}$ value on the last electron entered into Sc.

Answer:

Solution:

Scandium (Sc) has atomic number $Z = 21$ . Electron configuration: $[A r] 3 d^{1} 4 s^{2}$ . The last electron is in $3 d$ .

$Z_{e ff} = Z - S$ . Using Slater's rules, $S \approx 18$ .

$Z_{e ff} = 21 - 18 = 3$ .

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

⏱ 2mℹ️ Source: QB

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