Group 7 Elements

Question 1

What are the elements in group 7

Answer 1

Fluorine, chlorine, bromine, iodine, astatine

Question 2

What is group 7 call

Answer 2

Halogens

Question 3

What is the valence electron of group 7

Answer 3

7 electron shell in the valence shell

Question 4

Appearance of Halogens

Answer 4

Fluorine = Pale yellow gas
Bromine=Red brown liquid
Iodine=crystal shiny grey
Chlorine= yellow green

Question 5

Matters of group 7 elements

Answer 5

fluorine and chlorine are gases, bromine is a liquid, and iodine and astatine are solids.

Question 6

The properties of group 7 elements

Answer 6

As you go down the group:
Reactivity decreases boiling/melting point increases
The density increases.
They are poor conductors of heat

Question 7

Hazard of halogens

Answer 7

They are very highly reactive can be very harmful to organisms
Fluorine is the most reactive element, it is a corrosive and highly toxic gas. Chlorine gas is very toxic, low concentrations can cause eye irritation and affect throat and lung to be in pain. Bromine is a very corrosive oxidizing liquid, vapor attacks eye and lung with painful effects. Iodine is toxic , vapor irritates eye and lung.

Question 8

Halogens displacement reaction

Answer 8

A more reactive halogen can displace a less reactive halogen from a solution of one of its salts. Example; when chlorine is added to sodium bromide solution, chlorine takes the place of bromine because chlorine is more reactive than bromine, chlorine displace bromine from the sodium bromide. -