Class IX

To form anion, non-metal atom
  1. looses electrons
  2. gains electron
  3. losses protons
  4. gain protons
Ionic crystals have
  1. low melting points
  2. moderate melting points
  3. high melting points
  4. none of above
Helium is chemically
  1. active
  2. inert
  3. unstable
  4. none of above
. Atoms of metals form
  1. molecules
  2. anions
  3. cation
  4. none of above
When two identical atoms share electron pairs and exert force on each other then bond form is
  1. non-polar covalent bond
  2. double covalent bond
  3. double covalent bond
  4. coordinate covalent bond
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