Atomic Structure and the Periodic Table

This question is about the halogens.

Which group in the periodic table is known as the halogens?

• Group 1

• Group 2

• Group 7

• Group 0

Select all of the points that should have electrons drawn in to complete the dot and cross diagram

Chlorine reacts with potassium bromide solution. Complete the word equation.

​ (a)   + Potassium Bromide --> Potassium Chloride + ​ (b)  

• Chlorine
• Bromine

What type of reaction happens when chlorine reacts with potassium bromide solution?

• decomposition

• displacement

• neutralisation

• precipitation

Chlorine is more reactive than bromine.

This is because chlorine gains ​ (a)   more easily

• an electrons
• an atom
• a proton 
• a neutron

How does the size of a chlorine atom compare with the size of a bromine atom?

A chlorine atom is ​ (a)   a bromine atom. This is because it has ​ (b)   shells of electrons

• smaller than
• bigger than
• the same size as
• fewer
• more
• the same number of 

Fluorine reacts with chlorine to produce ClF₃

Balance the chemical equation for the reaction

Cl₂ + _F₂ → 2 ClF₃

Explain why fluorine is a gas at room temperature.

Fluorine is a ​ ​ (a)   molecule. Its has ​ (b)   intermolecular ​ (c)   between molecules, meaning ​ (d)   energy is needed to separate the molecules.

• simple covalent
• weak
• forces
• little
• giant ionic lattice
• giant covalent molecule 
• strong
• lots of
• bonds

This question is about the elements in Group 2 of the periodic table.

Figure 9 shows the positions of four elements, A, B, C, and D, in the periodic table.

• A

• B

• C

• D

One product of heating calcium carbonate is calcium oxide, name the other