Class VII

Representation of an object, system or phenomenon is done by
  1. scientific model
  2. key model
  3. atomic model
  4. role model
If an atoms loses electron ion obtained is charged
  1. positively
  2. negatively
  3. neutral
  4. smaller
Molecules which consists of fixed number of different types of atoms which are chemically combined together are of
  1. elements
  2. compounds
  3. mixtures
  4. all of them
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