Chemistry Final Material Quiz G9. 2018 2nd sem.

because the radius of the atom decreases

because the radius of the atom increases

the valence electron decreases and it becomes easier for the atom to lose its valence electrons

the force of attraction between nucleus and the valence electron decreases

the valence electron becomes far away from the nuclues

the valence electron decreases and it becomes harder for the atom to lose its valence electrons

the valence electron becomes closer to the nucleus

Have low melting points

Are strong and hard

Are high coloured

Can be solids

Can't be liquids

Have low melting and boiling points

Can be gases

Have high melting and boiling points

Most of the covalent compounds dissolve in water

Most of the covalnet compunds do not conduct electricity