Class IX

In periodic table, helium is placed at
  1. top left corner
  2. bottom right corner
  3. bottom left corner
  4. top right corner
As we go from left to right across period, electron affinity
  1. increases
  2. decreases
  3. remains same
  4. none of above
Shielding effect across period
  1. increases
  2. decreases
  3. becomes equal to above periods
  4. remains same
Ability of atom to attract electrons towards itself is called
  1. electron affinity
  2. electronegativity
  3. ionization energy
  4. shielding effect
Period number of 2713Al is
  1. 1
  2. 2
  3. 4
  4. 3
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