The nucleus of an isotope of sodium ($Na$) has a relative charge of $+11$. The relative mass of the nucleus is $24$.

Complete the symbol for this isotope.

$${}_{......}^{......}Na$$

A nucleus of this isotope emits beta-minus radiation.

State values for the relative charge and relative mass of the nucleus after this radiation is emitted.

• Relative charge: ..............................
• Relative mass: ..............................

The table shows some information for two different isotopes of sodium, labelled C and D.

Complete the sentences below to describe the nucleus of isotope C and the nucleus of isotope D.

Use phrases from the list:

• less than D

• more than D

• the same as D

• The number of protons in the nucleus of C is .............................. .

• The number of neutrons in the nucleus of C is .............................. .

A doctor needs to explore a patient's internal organs using a radioactive tracer. The doctor:

• Injects a radioactive isotope into the patient.
• Sets up a special camera outside the patient's body.
• Uses the camera to detect radiation emitted from the isotope.

Which radiation should be emitted by the isotope? Select from: Alpha, Beta, Gamma.

State a reason for your answer.

There are three radioactive isotopes available with the following half-lives:

• 5 minutes
• 8 hours
• 21 days

The doctor chooses the isotope with a half-life of 8 hours.

Suggest two reasons why 8 hours is the most suitable half-life.