Question

Two elements 'P and 'Q' belong to the same period of the modern periodic table and are in Group-1 and Group-2 respectively. Compare their following characteristics in tabular form :
(a) The number of electrons in their atoms
(b) The sizes of their atoms
(c) Their metallic characters
(d) Their tendencies to lose electrons
(e) The formula of their oxides
(f) The formula of their chlorides

Answer 1

$\begin{array}{cccc}& \text{Property}& \text{P}& \text{Q}\\ \text{(a)}& \text{No of}& 3,11,19& 4,12,20\\ & \text{electrons in the}& & \\ & \text{atom}& & \\ \text{(b)}& \text{Size of atom}& \text{Bigger}& \text{Smaller}\\ \text{(c)}& \text{Metallic}& \text{More}& \text{Less}\\ & \text{character}& \text{metallic}& \text{metallic}\\ \text{(d)}& \text{Tendency to}& \text{More}& \text{Less}\\ & \text{lose electrons}& & \\ \text{(e)}& \text{Formula of}& {\text{P}}_2\text{O}& \text{QO}\\ & \text{oxide}& & \\ \text{(f)}& \text{Formula of}& \text{PCI}& {\text{QCI}}_2\\ & \text{their chlorides.}& & \end{array}$