Isotope

Table shows the half-lives of four types of liquid isotopes which radiate β-particles.
Jadual menunjukkan separuh hayat bagi empat jenis cecair yang memancarkan zarah -β.

Isotope	Half-life/Separuh hayat
P	10 seconds
Q	20 hours
R	5 months
S	10 years

Which of the following isotopes is suitable to detect blood clotting?
Antara isotop berikut, yang manakah sesuai digunakan untuk mengesan pembekuan darah?

A P
B Q
C R
D S

Isotopes are atoms with ...............proton number but different ..................number.

Answer: B