Year 10 Chemistry - Week 2

Which subatomic particle gives each element its unique identity?

• Proton

• Neutron

• Electron

• Photon

An atom of the same element can have a different number of which two subatomic particles?

• Protons and electrons

• Neutrons and electrons

• Protons and neutrons

• Protons and photons

Where are the protons and neutrons located in the structure of an atom?

• In the nucleus at the centre

• Outside the nucleus

• In the electron cloud

• In the outer shell

Which subatomic particles are found outside the nucleus and can be removed more easily?

• Protons

• Neutrons

• Electrons

• Quarks

What is the result when a neutral atom gains or loses electrons?

• A particle with only positive charge

• A particle with only negative charge

• A particle with an overall positive or negative charge

• A particle with no charge

Why does an atom become an ion?

• Because it gains or loses protons

• Because it gains or loses electrons

• Because it splits into two

• Because it combines with another atom

Which of the following best describes the process that leads to the formation of a cation?

• Gain of protons

• Loss of neutrons

• Loss of electrons

• Gain of electrons

If a neutral atom becomes an anion, what can you infer about the change in its number of electrons?

• The atom lost electrons

• The atom gained electrons

• The atom lost protons

• The atom gained neutrons

Why do isotopes of the same element have different mass numbers?

• Because they have different numbers of neutrons.

• Because they have different numbers of protons.

• Because they have different numbers of electrons.

• Because they have different atomic numbers.

What does the mass number in the name of a hydrogen isotope tell us?

• The number of protons only

• The number of electrons only

• The total number of protons and neutrons

• The number of neutrons only