2 years ago

Umm care to help, please

Chemistry

2 answers:

marysya [2.9K]2 years ago

4 0

Answer:

17.5

Explanation:

Archy [21]2 years ago

3 0

Explanation:

Protons (the atomic number) and neutrons both contribute to the atomic mass.

If you therefore subtract the number of protons (19) from the atomic mass (39), you are left with the number of neutrons (=20).

hope this helped :)

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