An atom has an atomic number of 19 and a mass number of 39. How many electrons. protons and neutrons does it have?
Answers
Answered by
1
Answer:
sorry don't know sorry about it
Answered by
1
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). Hence, option A is correct.
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