Group 7 Halogens Flashcards
What group are the halogens?
group 7
How many electrons are on the outermost shells of the halogens?
7 electrons
How many electrons do they need to gain to get a full shell and what would be their charge as an ion?
they would have to gain 1 electron as to lose 7 because its easier.
therefore gaining 1 electron causes their charge to be 1-
What are the elements in group 7?
flourine, chlorine, bromine, iodine and astatine
What are the main halogens in this unit?
chlorine, bromine and iodine
What is chlorines colour and physical state at room temperature?
chlorine is a gas at room temperature (as well as flourine) it is pale yellowish green.
What is bromines colour and physical state at room temperature?
bromine is a liquid and is reddish brown at room temperature
What is iodines colour and physical state at room temperature?
iodine is a dark purple/gray solid at room temperature
What are the trends in physical properties of the halogens?
they get darker as you go down, they transition from gas to solid, their molecular size increases
Using the trends of halogens can you predict the properties of astatine?
it will be dark, solid, and have a large molecular weight/size
Explain displacement reactions
reactions between halogens and halides. the more reactive halogen can take the place of a less reactive halogen from its halide compound. it is an exothermic reaction (release heat)
What is oxidation?
losing electrons during a reaction
What is reduction?
gaining electrons during a reaction
What is a redox reaction?
a reaction in which reduction and oxidation occur. all halogen displacement reactions are redox.
