Year 9 Chemistry -REVISION 2023

The atomic number is:

• the number of protons in the atom and defines the element.

• the number of protons and neutrons in the atom.

• the number of neutrons in the atom.

• the number of electrons in the atom

Identify A,B and C given in the diagram.

• A-Electron B-Proton C-Neutron

• A-Proton B-Electron C-Neutron

• A-Neutron B-Electron C-Proton

• A-Neutron B-Proton C-Electron

1. The subatomic particle with a positive charge is the:

• Neutron

• Proton

• electron

• nucleus

The subatomic particle with negative charge is:

• Proton

• Electron

• Neutron

• Nucleus

The subatomic particle with no charge is:

• Proton

• Electron

• Neutron

• None

An atom’s volume is made up of mostly:

• electrons

• neutrons

• protons

• the nucleus

What two basic particles make up the nucleus of an atom?

• Electron and Protons

• Neutrons and Protons

• Neutrons and Electrons

• Neutrons only

An atom is said to have a neutral charge if it contains the same number of what two particles?

• Protons and Electrons

• Protons and Neutrons

• Neutrons and Electrons

• Protons only

Which of the atoms in the table above are the same element? (Hint: Elemenet is defined by its atomic number)

• Atom A and B

• Atom B and C

• Atom A and C

• Atom B and D

Which of the atoms above is an ion? (Hint: When an atom lbecomes an ion when it loses or gains electrons)

• A

• B

• C

• D