Radioactivity

What particles are atoms made up of?

• Neutrons, electrons, and molecules

• Protons, neutrons, and ions

• Protons, electrons, and atoms

• Protons, neutrons, and electrons

What does changing the number of neutrons in an atom create?

• An isotope

• A molecule

• A compound

• An ion

What is the relative charge of a proton?

• +2

• 0

• -1

• +1

What is the relative mass of an electron?

• Close to 0 (1/2,000)

• 0

• 1

• 1/2

What defines an element?

• The number of neutrons

• The number of protons

• The mass number

• The number of electrons

What is the mass number also known as?

• Electron number

• Nucleon number

• Proton number

• Neutron number

What happens to the number of electrons when an atom becomes ionised?

• It changes

• It increases by one

• It decreases by one

• It remains the same

In the symbol notation (_{A}^{Z}\textrm{X}), what does 'Z' represent?

• Atomic number

• Mass number

• Number of electrons

• Number of neutrons

How many neutrons does chlorine have according to its symbol notation?

• 17

• 35

• 18

• 20

What is an ion?

• An atom with the same number of protons and electrons

• An atom that has lost or gained one or more electrons

• An atom with a different number of protons and neutrons

• A molecule made up of two or more atoms