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25-11-2018
Chemistry

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If an element has 4 protons and 5 neutrons its mass number is

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25-11-2018

its atomic mass will equal up to 9

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25-11-2018

Answer:

9

Explanation:

The mass number (A) is the sum of the number of protons (p) and the number of neutrons (n).

A = p + n

p = 4

n = 5 Calculate A

A = 4 + 5

A = 9

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