Chem 10 - Group 7 Flashcards
(17 cards)
What state is fluorine at room temperature?
Pale yellow gas
What state is chlorine at room temperature?
Greenish gas
What state is bromine at room temperature?
Red-brown liquid
What state is iodine at room temperature?
Black solid
Why are the properties of fluorine untypical?
The F-F bond is weak
What happens to the size of atoms going down group 7?
They get bigger because each element has one extra filled main level of electrons
What happens to electronegativity going down group 7?
It decreases going down the group, fluorine is the most electronegative element
How can halogens react?
By gaining electrons to become negative ions
Fluorine is one of the most powerful what?
Oxidising agents known.
What happens to the oxidising ability going up group 7?
The oxidising ability of the halogens increases going up the group
What will halogens react with in solution?
Metal halides
What will happen when halogens react with metal halides in solution?
The halide in the compound will be displaced by a more reactive halogen
Are halide ions reducing agents?
Yes
What does it mean that halide ions are reducing agents?
Halide ions lose electrons and become halogens
If an ion in large is it easier or harder to lose an electron? Why?
It is easier because the outermost electron is further away from the nuclus
What happens when drops of conc sulphuric acid are added to solid sodium chloride? Why?
Steamy fumes of hydorgen chloride are seen because chlorine is too weak a reducing agent to reduce sulphur in sulphuric acid.
Name three examples of sodium halides
- sodium chloride
- sodium bromide
- sodium iodide
