CPeriodic Table Halogens Group 17

Halogens exist as

• atoms

• diatomic molecules

• triatomic molecules

The melting and boiling points of halogens __________ down Group 17.

• stay the same

• decrease

• increase

The most reactive halogen is

• fluorine

• chlorine

• bromine

• iodine

Fluorine is able to displace bromine from sodium bromide solution because

• fluorine is more reactive than bromine

• fluorine is less reactive than bromine

• sodium is very reactive

The halogens above bromine in Group 17 are

• darker in colour

• gases

• less reactive

• more dense

Chloride, Cl^-, has a -1 charge because during reaction, chlorine atom

• accepted 1 electron

• lost 1 electron

• lost 2 electrons

• accepted 2 electrons

The number of valence electrons each halogen atom has is

• 1

• 6

• 7

• 8

The atomic radii increase down Group 17. The electrostatic attraction between the positive nucleus and the electron to be taken into the valence shell _____________ down the group.

• becomes weaker

• becomes stronger

• stays the same

Fluorine is the most reactive halogen in Group 17 compared to the other halogens, because

• its atoms takes in valence electron most readily.

• its atoms gives away valence electrons most readily.

• it has the smallest mass

• its atomic radius is the greatest.

When chlorine gas is delivered into a solution of potassium bromide,

• potassium chloride and bromine is formed.

• there is no observable reaction.

• the solution remains colourless.

• chlorine is unable to displace bromine.