Write the name and symbols of two most reactive metals. Explain by drawing electronic structure how any one of the two metals react with a halogen. State any four physical properties of the compound formed.

Explanation

The two reactive metals are sodium (Na) and potassium (K).
`{:(Na,rarr,Na^(+)+e^(-),),("2,8,1",,"2,8",),(,,"(Sodium cation)",):}`
`{:(Cl,rarr,Cl^(-),),("2,8,7",,"2,8,8",),(,,"(Chloride anion)",):}`

Physical property of compound form :
(i) Ionic compounds have high melting and boiling points.
(ii) They are good conductors of electricity.
(iii) They are generally soluble in water and insoluble in organic solvents.
(iv) They are solids, hard and brittle.