Group 17

Question	Answer
Trend in bpt	Increase down group as: ^e- = more dipoles = stronger London forces More E to break IM forces
Trends in Reactivity	In redox X2 gains 1 electron Decreases down a group Atomic radius ^ Shielding ^ Ability to attract electron decrease
Halogen molecule state at RTP colour in hexane	F2 - Pale yellow gas Cl2 - Pale green gas - pale green Br2 - Red-brown liquid - orange I2 - Shiny grey/black solid - Violet
E config	s2p6
Role in redox reactions	Reduced gain an e- to get full OSE config.
Displacement	More reactive halogen will displace a less reactive halogen in a solution if its halide ions. i.e. Cl2 + 2Br- -> 2Cl- + Br2
How to differentiate between displaced halogens	Dissolve in hexane Cl2 -> pale green Br2 -> Orange I2 -> Violet
Disproportionation	Element is R and O in the same redox reaction
Cl2 disproportionation reactions (2)	+ H2O + NaOH (cold, dilute)
Cl2+H2O	HClO + HCl
Cl2+ 2NaOH	NaClO + NaCl + H2O
Why use NaOH?	Cl2 LIMITED by low sol. of Cl2 in H2O. If water contains NaOH then much more will dissolve.
Dangers	Chlorinated HC Chlorine gas

Resource summary

	Created by I Shouldn't be awake over 6 years ago