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Periodic Classification of Elements — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements1 Mark
Question
Arrange the following elements according to the instructions written in paranthesis.Fe, Hs, Ru, Os (increasing number of valence shells).
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Answer

Fe, Hs, Ru, Os all belong to the same group. On moving down a group, the number of shells increases. Thus the increasing order for number of shells is Fe < Ru < Os < Hs.

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