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Periodic Classification of Elements — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements1 Mark
MCQ
How did Mendeleev predict the existence of some elements yet to be discovered elements in his periodic table?
  • ✓
    Gaps
  • B
    Atomic number
  • C
    Mass number
  • D
    None of the above
✓

Answer

Correct option: A.
Gaps
Professor Dmitri Mendeleev published the first periodic table of the atomic elements in 1869 based on properties which appeared with some regularity as he laid out the elements from lightest to heaviest.
When Mendeleev proposed his periodic table, he noted gaps in the table, and predicted that as $-$ of $-$ yet unknown elements existed with properties appropriate to fill those gaps.

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