PT_Group 1

• They have one outer shell electron in each atom.

• They have seven outer shell electrons in each atom.

• They have different number of shells of electrons.

• They have different chemical properties.

• A white precipitate is formed.

• The resulting solution turns blue litmus red.

• An alkali and hydrogen gas are formed.

• A gas is evolved that relights a glowing splint.

• in water

• in air

• in oil

• in sand

• soft

• low density

• good electrical conductor

• high melting point

• chemical reactivity increases

• melting and boiling points increase

• density decreases

• colour of the elements gets darker