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3. Classification of elements and periodicity in properties — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
The fundamental basis of the present-day Periodic Table is that elements are
  • A
    Arranged in the order of increasing atomic weights
  • B
    Grouped according to chemical properties
  • C
    Arranged in the order of increasing number of neutrons in the atomic nucleus
  • ✓
    Arranged in the order of increasing number of protons in the nucleus
✓

Answer

Correct option: D.
Arranged in the order of increasing number of protons in the nucleus
d
According to present day periodic table, elements are arranged in order of increasing atomic number. The atomic number is equal to number of protons in the nucleus of atom.

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