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
When an electron is added in valence shell then
  1. energy is absorbed
  2. energy is released
  3. energy remains same
  4. force of attraction increases
Decrease in force of attraction between valence electrons and nucleus by inner electrons is called
  1. screening effect
  2. shielding effect
  3. photoelectric effect
  4. dopler effect
On basis of electronic configuration group and period of 95B is
  1. 2 and IIIA
  2. 3 and IIA
  3. 4 and VIA
  4. 5 and VIIA
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