Question

what are halogens?n what r its characteristics?

Answer 1

Halogens are lighter radioactive elements that have a valency of 1.
Halogens are.light
Halogen are moslty in gaseous state in their pure form.

Answer 2

Fluorine F,Chlorine Cl, Bromine Br, Iodine I, Astatine At.Group 7th a elements.Same number of valence electrons (7).Reactivity decrease.Size increase as no. of shells increase.
These elements are known as halogens as they form salts.The word 'halo' means salt and 'gen' means forming and hence salt forms are known as halogens.
Physical properties-
1.Physical state.
2.Conductivity.
3.Electronegativity.
Chemical properties-
1.Reactivity.
2.Oxidizing property.
3.Hydride formation.