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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.
Cu, Mn, Ge, Sc (increasing atomic size).
✓

Answer

Cu, Mn, Ge, Sc all belong to same period. The order in which they appear in the period in left to right direction is: Sc → Mn → Cu → Ge. The atomic size decreases on moving along a period. This is because of the increase in the effective nuclear charge on moving from left to right which tends to pull the electrons towards the nucleus. Therefore, the increasing order of atomic sizes is: Ge < Cu< Mn< Sc.

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