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Periodic Classification of Elements — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements3 Marks
Question
Name:
  1. Three elements that have a single electron in their outermost shells.
  2. Two elements that have two electrons in their outermost shells.
  3. Three elements with filled outermost shells.
✓

Answer

  1. Three elements that have a single electron in their outermost shell are:
  1. Lithium
  2. Sodium
  3. Potassium.
  1. Two elements that have two electrons in their outermost shell are:
  1. Magnesium
  2. Calcium.
  1. Three elements with filled outermost shell are:
  1. Argon
  2. Helium
  3. Neon.

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