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- 1. Determining the Subatomic Particles of an Atom<br />
- 2. To find the number of protons, electrons, and neutrons in a specific atom follow the following four steps.<br />
- 3. Step 1<br />Gather data – Find the atomic number and the atomic mass of the element.<br />Atomic Number<br />Atomic Mass<br />
- 4. Step 2<br />Identify the number of protons<br />The atomic number represents the number of protons in an atom.<br />If you add or subtract protons you end up with an entirely different element.<br />
- 5. Step 3<br />Identify the number of electrons<br />Atoms are neutral, so to balance the number of positive charges you must have an equal number of negative charges.<br />So the number of electrons is the same as the number of protons to keep the atom neutral.<br />
- 6. Step 4<br />Identify the number of neutrons<br />Round the atomic mass to the nearest whole number.<br />Example 14.65 = 15<br />The atomic mass represents the number of protons and the number of neutrons in the nucleus. <br />So subtract the atomic number from the atomic mass to find the number of neutrons in the atom.<br />
- 7. APE MAN<br />A = Atomic number<br />P = Protons<br />E = Electrons<br />M = (Atomic) Mass<br />A = Atomic (Number)<br />N = Neutron<br />
- 8. MAN<br /> Atomic Mass <br /> - Atomic Number<br /> = Neutron<br />
- 9. Now you try it!<br />Oxygen <br />Atomic number = 8<br />Atomic mass = 15.999<br />How many neutrons does this atom have?<br />

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