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Periodic Classification of Elements — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements2 Marks
Question
On the basis of electronic configuration, how will you identify:
  1. Chemically similar elements?
  2. The first element of a period?
✓

Answer

  1. All the chemically similar elements will have same valence electrons.
  2. The 1st element in a period is determined by the no. of valence electrons in its atoms. The 1st element of every period has 1 valence electron.

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