The Atom and Alpha Radiation

What does the breakdown of unstable isotopes cause?

• Chemical reactions

• Ionising radiation

• Nuclear fusion

• Thermal expansion

Which particle is responsible for the negative charge in an atom?

• Proton

• Neutron

• Electron

• Positron

How many protons does the lithium atom have?

• 2

• 3

• 4

• 5

What is the mass number of the lithium atom?

• 5

• 6

• 7

• 8

Where is the proton located in an atom?

• Outside the nucleus

• In the nucleus

• In the electron cloud

• In the atomic shell

What is the relative electric charge of a neutron?

• +1

• 0

• -1

• +2

Which subatomic particle has a negative electric charge?

• Proton

• Neutron

• Electron

• Positron

Which of the following is true about isotopes of an element?

• They have different atomic numbers

• They have the same number of protons

• They have different chemical properties

• They have the same mass number

What is the mass number of hydrogen 3?

• 1

• 2

• 3

• 4

What does the number 92 represent in the notation "235/92 U"?

• Atomic number

• Mass number

• Neutron number

• Electron number