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Molodets [167]
3 years ago
15

An atom of a certain element has 18 protons, 18 electrons, and a mass number

Biology
1 answer:
Serga [27]3 years ago
5 0

Answer:

40-18 = 22

Explanation:

The mass number is the sum of the neutrons and protons.  You know you have 18 protons and a mass number of 40.

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