Class IX

Value of ionization energy
  1. decreases down the group
  2. increases down the group
  3. remains same down the group
  4. none of above
Elements that lie in same column have
  1. similar properties
  2. different properties
  3. same physical properties
  4. different chemical properties
Horizontal rows of periodic table are called
  1. rows
  2. periods
  3. columns
  4. none of above
size of atom
  1. size of atom
  2. size of proton
  3. size of neutron
  4. no. of electrons
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
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