Question

Quick Check
2. If the mass number of phosphorus is 31 and the atomic number is 15, find the number
of electrons, protons and neutrons.

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Answer 1

Answer:

the atomic number is 15 which means the number of electrons are equal to 15 and the number of protons is also equal to 15.

mass number is equal to number of protons + number of neutrons, show the number of neutrons is equal to 31 - 15 = 16.

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Answer 2

Answer:

the element phosphorus (P) has an atomic number of 15 and a mass number of 31. Therefore, an atom of phosphorus has 15 protons, 15 electrons, and 16 neutrons (31-15)=16