Class IX

Helium is chemically
  1. active
  2. inert
  3. unstable
  4. none of above
When one atom forms cation by losing electron and other forms anion by accepting that electron then bond form between them is
  1. Covalent bond
  2. Ionic bond
  3. coordinate covalent bond
  4. none of above
Nobel gases are stable because they contain
  1. 7 electrons in valence shell
  2. 8 electrons in valence shell
  3. 5 electrons in valence shell
  4. 4 electrons in valence shell
Atoms of metals form
  1. anions
  2. molecules
  3. cation
  4. none of above
Ionic crystals have
  1. low melting points
  2. moderate melting points
  3. high melting points
  4. none of above
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