Problem: If an atom has an atomic number of 9 and an atomic mass number of 19, how many protons, neutrons, and electrons does it have?

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FREE Expert Solution

We’re being asked to determine number of protons, electrons, and neutrons given the atomic number and mass number.


Given an atom with:

  • atomic number = 9
  • atomic mass = 19

We will first determine the proton, followed by the number of neutrons, and lastly the number of electrons.

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Problem Details

If an atom has an atomic number of 9 and an atomic mass number of 19, how many protons, neutrons, and electrons does it have?