Snapquiz - Isotopes

Question 1. A chlorine atom contains 17 protons and 17 electrons. About 25% of chlorine atoms are the chlorine-37 isotope. How many neutrons does one of these atoms contain?

18.
3.
17.
20.

Question 2. How is a tritium atom different from a hydrogen atom?

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

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

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

Question 4. How are isotopes of an element similar to each other?

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

Question 5. How is a uranium-235 atom different from a uranium-238 atom?

It has three less neutrons.
It has three extra neutrons.
It has three extra protons.
It has three less protons.

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