Snapquiz - Isotopes

Question 1. How is a tritium atom different from a hydrogen atom?

It has two extra neutrons.
It has one extra neutron.
It has two extra protons.
It has one extra proton.

Question 2. A chlorine atom contains 17 protons and 17 electrons. About 75% of chlorine atoms are the chlorine-35 isotope. How many neutrons does one of these atoms contain?

20.
17.
18.
1.

Question 3. Which number tells us which isotope we are dealing with?

The electron number.
The proton number.
The mass number.
The atomic number.

Question 4. How would a glass of water made with hydrogen-2 atoms be different to a glass of water made with hydrogen-1 atoms?

It would be slightly heavier.
It would have a different taste.
It would be a different colour.
It would be radioactive.

Question 5. How are isotopes of an element similar to each other?

They have the same number of protons.
They have the same number of neutrons.
They have the same mass number.
They have no similarities.

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