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Group 7, the Halogens WALT – Explain the properties of ‘SALT FORMERS’ WILF – Questions answered. Representative Elements. 2. Group 7—The Halogen Group. All the elements in Group 7 are nonmetals except for astatine (a radioactive metalloid). Halogens = “salt-former.”.

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group 7 the halogens walt explain the properties of salt formers wilf questions answered

Group 7, the HalogensWALT – Explain the properties of ‘SALT FORMERS’WILF – Questions answered

slide2

Representative Elements

2

Group 7—The Halogen Group

  • All the elements in Group 7 are nonmetals except for astatine (a radioactive metalloid)
  • Halogens = “salt-former.”
  • All of the halogens form salts with sodium and with the other alkali metals.
slide3

Representative Elements

Group 17—The Halogen Group

  • The halogen fluorine is the most reactive of the halogens in combining with other elements.
  • Chlorine less reactive than fluorine,
  • bromine less reactive than chlorine.
  • Iodine is the least reactive of the four nonmetals.
  • How does this compare with the reactivity of group 1 metals?
slide4

Decreasing

reactivity

Cl

Cl

Some facts…

1) Reactivity DECREASES as you go down the group

(This is because the electrons are further away from the nucleus and so any extra electrons aren’t attracted as much).

2) They exist as diatomic molecules (so that they both have a full outer shell):

3) Because of this fluorine and chlorine are liquid at room temperature and bromine is a gas

the halogens some reactions

H

H

Cl

Cl

Halogen + metal ionic salt

Na

+

-

Cl

Na

Cl

Halogen + non-metal covalent molecule

The halogens – some reactions

1) Halogen + metal:

+

2) Halogen + non-metal:

+

slide6

Section Check

Question 1

What does the term “halogen” mean?

slide7

Section Check

Answer

Halogen means “salt-former.” All the halogens form salts with sodium (and other alkali metals).

slide8

Finish answering questions on Noble Gases, Pg133

  • Answer questions on Halogens, pg 131
  • As you are doing this QUIETLY I shall hand out the test papers
displacement reactions

Decreasing reactivity

Displacement reactions

To put it simply, a MORE reactive halogen will displace a LESS reactive halogen from a solution of its salt.

halogen compounds
Halogen compounds

Silver halides(e.g. silver chloride, silver bromide etc)

These are used in photographic paper. They are reduced by light and x-ray radiation to leave a silver photographic image.

Hydrogen halides(e.g. hydrogen chloride, hydrogen fluoride)

When these dissolve in water they make acids and will turn universal indicator red.

slide11

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