(b) Electronegativity across the period ………… [increases/decreases].

(c) Non-metallic character down the group ………… [increases/decreases].

(d) Atomic number of an element is 16. State

(i) to which period it belongs

(ii) the number of valence electrons in the element

(iii) is the element metal or non-metal 

Answers:

(a) The number of electrons in the valence shell of a halogen is 7.

(b) Electronegativity across the period increases.

(c) Non-metallic character down the group decreases.

(d) The atomic number of an element is 16.

(i) The element belongs to period 3

(ii) 6 is the number of valency electrons in the element.

(iii) The element is a non-metal.