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Periodic Classification of Elements — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements1 Mark
MCQ
Which of the following statement about the modern periodic table is correct?
  • A
    It has $18$ horizontal rows known as periods.
  • B
    It has $7$ vertical columns known as periods.
  • ✓
    It has $18$ vertical columns known as groups.
  • D
    It has $7$ horizontal rows known as groups.
✓

Answer

Correct option: C.
It has $18$ vertical columns known as groups.
In the modern periodic table, there are $18$ vertical columns known as groups.

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