Which of the following are found in the nucleus of an atom?

• Protons

• Protons and neutrons

• Electrons

• Neutrons and electrons

'The building blocks that make up matter' are called

• Atoms

• Elements

• Molecules

• Compounds

'Two or more different atoms joined together by chemical bonds' is called a

• Atom

• Molecule

• Element

• Compound

The charges of each subatomic particle is as follows

• Proton: Positive

  Neutron: Negative

  Electron: No charge

• Proton: Negative

  Neutron: Positive

  Electron: Negative

• Proton: No charge

  Neutron: No charge

  Electron: No charge

• Proton: Positive

  Neutron: No charge

  Electron: Negative

A helium atom

• Is also an example of a reactive molecule

• Has 4 protons in its nucleus

• Has 4 neutrons in its nucleus

• Is neutrally charged

'K' is the element symbol for

• Iron

• Potassium

• Sulfur

• Barium

Aluminium has 13 protons, 1 neutron, 13 electrons. What is the atomic number?

• 26

• 1

• 13

• 12

Radium has an atomic number of 88. It has 138 neutrons. What is its mass number?

• 88

• 50

• 226

• 138

The mass number is

• 50

• 119

• 69

• 169

The number of neutrons is

• 28

• 58.693

• 31

• 87