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.

Fill in the Blank

What element is this?

Fill in the Blank

What is the atomic number of this atom?

Fill in the Blank

What is the atomic mass of this atom?

Fill in the Blank

What isotope is this?

*Write your answer in for form of "element-##"

(e.g. carbon-14).

Fill in the Blank

What is the atomic mass of this isotope?

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How many neutrons does this isotope have?

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

Fill in the Blank

How many protons are in potassium-40?

Fill in the Blank

How many neutrons are in potassium-40?