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11.01
Your answer should include all the following pieces of information. Check off each of the items you included in your answer.
Write a brief passage describing a neutral atom of nitrogen-14 (N-14). Describe the number of protons, neutrons, and electrons in the atom, where each type of particle is located, and how the terms atomic number, mass number, and atomic mass are related to the particles. Use the periodic table to help you.
A neutral nitrogen-14 atom has 7 protons and 7 neutrons in its nucleus, and 7 electrons in orbitals around the nucleus. Nitrogen’s atomic number, 7, is its number of protons. Its mass number, 14, is the sum of its protons and neutrons. The mass of nitrogen-14 is approximately the combined mass of those protons and neutrons; the atomic mass on the periodic table is a weighted average of nitrogen’s naturally occurring isotopes.
An atom of sodium-23 (Na-23) has a net charge of +1. Identify the number of protons, neutrons, and electrons in the atom. Then, explain how you determined the number of each type of particle. Use the periodic table to help you.
It has 11 protons, 12 neutrons, and 10 electrons. Sodium’s atomic number is 11, which gives the number of protons. Subtracting the atomic number from the mass number (23 − 11) gives 12 neutrons. Since protons have a +1 charge and electrons have a −1 charge, a net charge of +1 means the atom has one fewer electron than proton: 10 electrons.
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11.01
Your answer should include all the following pieces of information. Check off each of the items you included in your answer.
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