Class IX

Period number of element indicates n
  1. value of all shells
  2. value of valence shell
  3. value of 1st shell
  4. none of above
Both of elements of 1st period contains valence electrons in
  1. M shell
  2. N shell
  3. K shell
  4. S shell
Energy required to remove an electron from outermost shell is called
  1. potential energy
  2. kinetic energy
  3. mechanical energy
  4. ionization energy
Groups contain alkaline earth metals are
  1. IA
  2. IIIA
  3. IIA
  4. IVA
Shielding effect across period
  1. increases
  2. decreases
  3. becomes equal to above periods
  4. remains same
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