Ions

Select the true sentence.

• Atoms can only gain electrons.

• Atoms can only lose electrons.

• Atoms can gain or lose electrons.

• Atoms cannot gain or lose electrons.

Select the correct ending for this sentence. 'When atoms lose or gain electrons they will...

• ...form an inner shell.'

• ...form an outer shell.'

• ...remain unchanged.'

• ...form both an inner and outer shell.'

Write down the term which means 'a charged particle formed when atoms gain or lose electrons, forming an outer shell.'

Select the best explanation for why ions are charged.

• The number of protons is different to the number of electrons.

• The number of protons is the same as the number of electrons.

• There is no difference in between the number of electrons and protons.

• None of these explanations is correct.

Select the term which means 'a particle made of more than one atom that has an overall positive or negative charge'.

• An ion

• A molecular ion

• A molecule

• An ionic compound

Select the best ending for this sentence. 'Ions are formed when...'

• Electrons are transplanted.

• Electrons are transported.

• Electrons are transformed.

• Electrons are transferred.

Write down the term for a negatively charged ion.

Write down the term for a positively charged ion.

Select the correct ending to this sentence. 'Anions are negatively charged...

• ...because the number of protons and electrons is equal.'

• ...because they contain more protons than electrons.'

• ...because they contain more electrons than protons.'

• ...because they contain less electrons than protons.'

Select the correct ending to this sentence. 'Cations are positively charged...

• ...because the number of protons and electrons is equal.'

• ...because they contain more protons than electrons.'

• ...because they contain more electrons than protons.'

• ...because they contain less electrons than protons.'