Number of valence electrons in Magnesium is–

(1) 12
(2) 10
(3) 8
(4) 2

All the elements in a group have the

(1) Same valency
(2) Different valency
(3) Variable valency
(4) None of these

On moving from left to right in a period of the periodic table, the atomic number of elements increases. What happens to the size of atoms of elements on moving from left to right in a period ?

(1) Increases
(2) Decreases
(3) Remains the same
(4) First increaeses then decreases

Which of the following is the correct order of relative sizes ? 

(1) I^– > I⁺ > I 
(2) I^– > I > I⁺
(3) I > I⁺ > I^–
(4) I⁺ > I^– > I

The element E, F, G, H and I have atomic number 9, 11, 17, 12 and 13 respectively. The pair of elements which belongs to the same group of the periodic table is 

(1) F and H 
(2) E and G 
(3) H and I 
(4) E and F