Formative Practice 8.3 – Form 4 Science (KSSM) Chapter 8


Question 1:
State the definition of isotopes.

Answer:
Two or more atoms of an element which have atoms with the same number of protons but different number of neutrons.


Question 2:
Give three examples of isotopes.

Answer:
Sodium-24/ Phosphorus-32/ Cobalt-60/ Carbon-14/ Iodine-131
(any three)


Question 3:
An atom has 10 protons, 10 neutrons and 10 electrons. What is the nucleon number of that atom?

Answer:
20

Question 4:
What are the uses of isotopes in the medical field?

Answer:
• Cobalt-60: kills cancer cells

• Sodium-24: detects clogged blood vessels

• Iodine-131: detects the rate of iodine absorption by the thyroid gland and it is used to treat thyroid disease

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