Group 7 Elements Flashcards
What are the Group 7 elements otherwise known as?
They are known as the Halogens.
What are the properties of these Halogens?
Fluorine is a very reactive, poisonous yellow gas.
Chlorine is a fairly reactive, poisonous dense green gas.
Bromine is a dense, poisonous, red-brown volatile liquid.
Iodine is a dark grey crystalline solid or a purple vapour.
They are molecules - pair of atoms
What are the trends of the Group 7 metals as you go down the group.
They become less reactive as you go down the group - it’s harder to gain an extra electron, because the outer shell is further from the nucleus
They have higher melting and boiling points
They have higher relative atomic masses
Why do the group 7 elements act in similar ways
This is because they all have seven electrons in their outer shell.
How can halogen atoms reach a full outer shell?
They can share electrons with other non-metals through covalent bonding to form molecular compounds.
What is the structure of a molecular compound?
It has simple molecular structures.
What happens when Halogens bond with metals?
They form Ionic bonds.
What is a halide?
It is a halogen ion that has a charge of 1-.
What is the structure of the compound that is formed when halogens bond with metals?
Ionic structure.
What happens when two halogens are both reactants in a chemical reaction?
A displacement reaction will occur between a more reactive halogen and the salt of a less reactive one - More reactive halogens will displace less reactive halogens.
