Class X

Mendeleev’s periodic table is based on the
  1. Atomic weight
  2. Atomic number
  3. Atomic radius
  4. ) Atomic volume.
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
As we move from top to bottom in a group in modern periodic table, generally atomic size of elements
  1. increases
  2. decreases
  3. remains same
  4. approaches zero
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
Modern periodic table is based on _______.
  1. atomic mass
  2. mass number
  3. atomic number
  4. atomic volume
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