The nucleus of an isotope of phosphorus ($P$) has a relative charge of $+15$. The relative mass of the nucleus is $32$.

Complete the symbol for this isotope. ${}_{......}^{......}P$

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 phosphorus, labelled X and Y.

Complete the sentences below to describe the nucleus of isotope X and the nucleus of isotope Y.

Use phrases from the list:

• less than Y

• more than Y

• the same as Y

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

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

A clinical specialist needs to examine a patient's thyroid gland using a radioactive tracer. The specialist:

• Injects a radioactive isotope into the patient.
• Sets up a radiation detector outside the patient's neck.
• Uses the detector to monitor 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:

• 10 seconds
• 6 hours
• 45 days

The specialist chooses the isotope with a half-life of 6 hours.

Suggest two reasons why 6 hours is the most suitable half-life.