Group 7 Elements Flashcards
Atomic Structure and the Periodic Table (20 cards)
What are the main characteristics of halogens?
All non-metals with coloured vapours
What is Florine?
A very reactive, poisonous yellow gas
What is Chlorine?
A fairly reactive, poisonous dense green gas
What is Bromine?
A dense, poisonous, red-brown volatile liquid
What is Iodine?
A dark grey crystalline solid or a purple vapour
What do all halogens exist as?
Molecules which are pairs of atoms
What happens to reactivity as you go down Group 7?
Become less reactive
As you go down Group 7, halogens have _______.
Higher melting and boiling points
As you go down Group 7, halogens have _______.
Higher relative atomic mass
Why do all Group 7 elements react in similar ways?
They all have seven electrons in their outer shell
How do halogen atoms achieve a full outer shell?
By sharing electrons via covalent bonding
What is a covalent bond?
A bond formed when atoms share electrons
Give examples of molecular compounds formed by halogens.
- HCl
- PCl3
- HF
- Cl2
What type of ions do halogens form when bonding with metals?
Halides (F-, Cl-, Br-, I-)
What type of structures do the compounds formed by halogens and metals have?
Ionic structures
What is a displacement reaction?
A reaction where a more reactive halogen displaces a less reactive one
Which halogen can displace bromine and iodine from their salts?
Chlorine
True or False: Bromine can displace iodine from its salt.
True
What is the ionic formula for sodium chloride?
NaCl
What is the ionic formula for iron(III) bromide?
FeBr3
