Problem: A neon isotope has a mass number of 21.How many neutrons does it contain?Express your answer in neutrons as an integer.

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atomic mass = # neutrons + # protons

atomic number = # protons

# neutrons = atomic mass - atomic number


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Problem Details

A neon isotope has a mass number of 21.

How many neutrons does it contain?

Express your answer in neutrons as an integer.

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What scientific concept do you need to know in order to solve this problem?

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