Isotopes

Isotopes

The questions in this lesson will be graded. Taking notes on your own paper will be helpful!

Multiple Select

Which of the following are the SAME between two isotopes?

• atomic number

• protons

• neutrons

• atomic mass

• the element

Multiple Select

Which of the following are DIFFERENT between two isotopes?

• atomic number

• protons

• neutrons

• atomic mass

• the element

Isotope Notation

Scientists have to communicate a lot of information about the atoms they are talking about. It would be frustrating to write it all out in sentences, so they use a shorthand notation that shows everything you might need to know.

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Uranium-235

This is the correct way to write uranium-235. This atom has 92 protons (the atomic number) and 143 neutrons (atomic mass - atomic number). Its mass is 235.

Multiple Choice

Which of these is the correct way to write oxygen-18?

• A

• B

• C

• D