An element which is an essential constituent of all organic compounds belongs to :

  • A
    Group $1$
  • B
    Group $15$
  • C
    Group $14$
  • D
    Group $16$

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Give an account of the process adopted by Mendeleev for the classification of elements. How did he arrive at Periodic Law?

Arrange the following elements in increasing order of their atomic radii.
$(a)$ $Li, Be, F, N$
$(b)$ $Cl, At, Br, I$

If an element $X$ is placed in group $14$,what will be the formula and the nature of bonding of its chloride?

Name the following:
$(a)$ $A$ metal that can be cut with a knife.
$(b)$ $A$ metal that is liquid at room temperature.
$(c)$ $A$ metal that has $3$ valence electrons.

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