Group 7 Halogens

colour of Cl2 at room temp

green

state of Cl2 at room temp

gas

colour of Br2 at room temp

orange/brown

state of Br2 at room temp

liquid

colour of I2 at room temp

grey/black, purple

state of I2 at room temp

solid/vapour

melting and boiling points increase/decrease as you go down the group

increase

why do melting and boiling points increase as you go down the group?

increasing intermolecular forces as the atoms get larger. more energy required to overcome forces.

colour, state and reactivity of F2 (Fluorine)

pale yellow gas. highly reactive.

colour, state and reactivity of At2 (Astatine)

black solid, least reactive in VII

KCl + Cl2(aq) reaction

none

KCl + Br2(aq) reaction

none

KCl + I2(aq) reaction

none

KBr + Cl2(aq) reaction

orange solution (Br2) - Cl has displaced Br

KBr + Br2(aq) reaction

none

KBr + I2(aq) reaction

none

Kl + Cl2(aq) reaction

brown solution (I2) - Cl has displaced I

Kl + Br2(aq) reaction

brown solution (I2) - Brhas displaced I

Kl + I2(aq) reaction

none

what is oxidation?

loss of electrons

what is reduction?

gain of electrons

reactivity increases/decreases going down group

decreases