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This quiz contains 6 questions from a mix of 1 subtopics.

There are two definitions you can use to describe isotopes:


mass / protons / neutrons 


Definition1: 'Isotopes are atoms with the same atomic number, but different numbers.' 


or


Definition 2: 'Isotopes are atoms with the same number of , but different numbers of .'

mass
protons
neutrons

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Illustration showing an atom with 13 protons and 14 neutrons.

An atom has 13 protons and 14 neutrons. What is its mass number?

27

13

14

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What are isotopes?

Atoms of the same element with different numbers of electrons
Atoms of the same element with different numbers of neutrons
Atoms of the same element with different numbers of protons

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Four atoms have the numbers of protons and neutrons given below. Which two atoms are isotopes of the same element?


Atom W: 11 protons and 10 neutrons


Atom X: 10 protons and 10 neutrons


Atom Y: 9 protons and 9 neutrons


Atom Z: 10 protons and 9 neutrons

X and Y

W and Z

X and Z

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Lithium naturally exists as two isotopes: lithium-6, with an abundance of 7.6%, and lithium-7, with an abundance of 92.4%.


What is the relative atomic mass of lithium? 

6.08

6.92

6.50

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Illustration showing Uranium-235 with 92 protons and an unknown number of neutrons.

Uranium-235 has 92 protons. How many neutrons does it have?

143

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