Group 7 Halogens (chlorine, bromine and iodine)

What are the colors and physical state (at room temperature) of Chlorine?

Chlorine is a yellow-green Gas at room temperature

What are the colors and physical state (at room temperature) of Bromine?

Bromine is a red-brown Liquid

What are the colors and physical state (at room temperature) of Iodine?

Iodine is a purple Solid

What are the trends of the physical properties of group 7?

There is a trend from Gas to Liquid to Solid as you go down the group

Why do the elements state change as you go down the group?

Because the melting and boiling points increase as you go down the group. * From this you can predict that any halogens above chlorine will be gases (as their boiling points are even lower)

What is a displacement reaction?

A displacement reaction happens when a more reactive halogen pushes out (displaces) a less reactive halogen from one of its compounds

What would happen if Chlorine and Potassium Bromide tried to react?

Chlorine would displace bromine and iodine, bromine would displace iodine, but iodine can’t displace neither chlorine or bromine, giving you Potassium Chloride + Bromine because the Chlorine would’ve kicked the Bromine out of the compound

What is the trend of reactivity of group 7 Halogens as you go down the group based on electronic configuration?

Halogens react by gaining one electron, but as you go down the group the outer shell gets further away from the nucleus and there is more shielding the electron. This weakens the attraction for incoming electrons