Class X

An element belongs to period 2 and group 2 th number of valence electrons in the atoms of this element is.
  1. 2
  2. 4
  3. 3
  4. 1
Group 17 elements are also called as
  1. Alkali Metals
  2. Alkaline Earth Metals
  3. Halogens
  4. Noble Gases
The law of triads is not applicable on
  1. Cl, Br, I
  2. S, Se, Te
  3. Na, K, Rb
  4. Ca, Sr, Ba
When we move from left to right across a period, the electron affinity
  1. approaches zero
  2. remains the same
  3. decreases
  4. increases
Identify the wrong sequence of the elements in a group
  1. Ca, Br, Ba
  2. Cu, Au, Ag
  3. N,P, As
  4. Cl, Br, I
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