Class IX

Chlorine-35 exists in nature about
  1. 35%
  2. 40%
  3. 50%
  4. 75%
Protium has
  1. one neutron
  2. two neutrons
  3. no neutron
  4. 3 neutrons
Atoms having same atomic number but different atomic mass are
  1. same
  2. isotopes
  3. makes different elements
  4. effects chemical properties
If n = 3 we are in
  1. K shell
  2. L shell
  3. M shell
  4. f shell
D sub-shell can accommodate maximum
  1. 2 electrons
  2. 10 electrons
  3. 14 electrons
  4. 6 electrons
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