Prediction of Period, Group and Block of element. – InterviewSolution

1.

Prediction of Period, Group and Block of element.

Answer»

1. Period = Principal quantum number of valence shell

2. Block = Orbital in which last electron enters

3. Group

Block group no.

s number of valence e^-1 s

p 12 + number of valence e^- s

d number of e^-1 s in (n-1) d + electron in ns orbitals

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