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Periodic Table, Periodic Properties and Variations of Properties — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryPeriodic Table, Periodic Properties and Variations of Properties1 Mark
MCQ
Which pair of atomic numbers represents s-block elements :
  • A
    9, 17
  • B
    7, 15
  • ✓
    3, 12
  • D
    3, 17
✓

Answer

Correct option: C.
3, 12
(c) 3, 12
Explanation : The pair of atomic numbers 3 and 12 represents elements which belong to s-block. These elements are Li and Mg. They are alkali and alkaline earth metals respectively.

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