Middle School

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------------------------------------------------ An atom of tin has an atomic number of 50 and a mass number of 119. How many protons, electrons, and neutrons are found in one neutral atom of tin?

A. 50 protons, 69 electrons, 50 neutrons
B. 50 protons, 50 electrons, 69 neutrons
C. 69 protons, 50 electrons, 69 neutrons
D. 69 protons, 69 electrons, 50 neutrons

Answer :

B 50 protons, 50 electrons, 69 neutrons (cause protons and electrons have the same number and how u get neutrons is that u have to subtract the mass number from the atomic number)

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