Class X

Which element still has dicey position in modern periodic table?
  1. Carbon
  2. Nitrogen
  3. Oxygen
  4. Hydrogen
In the third period of the periodic table the element having smallest size is
  1. Na
  2. Ar
  3. Cl
  4. Si
Identify the group which is not a Dobereiner triad
  1. Li, Na, K
  2. . Be, Mg, Cr
  3. Ca, Sr, Ba
  4. Cl, Br, I
14 elements after actinium is called
  1. Lanthanides
  2. Actinides
  3. D-block elements
  4. P block elements
The law of triads is not applicable on
  1. Cl, Br, I
  2. S, Se, Te
  3. Na, K, Rb
  4. Ca, Sr, Ba
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