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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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?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Subatomic Particles concept. You can view video lessons to learn Subatomic Particles. Or if you need more Subatomic Particles practice, you can also practice Subatomic Particles practice problems.

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Based on our data, we think this problem is relevant for Professor Brandt's class at UIC.