Chapter 2: Problem 13

For each of these species, determine the number of protons and the number of neutrons in the nucleus: \({ }_{2}^{3} \mathrm{He},{ }_{2}^{4} \mathrm{He},{ }_{12}^{24} \mathrm{Mg},{ }_{12}^{25} \mathrm{Mg},{ }_{22}^{48} \mathrm{Ti},{ }_{35}^{79} \mathrm{Br},{ }_{78}^{195} \mathrm{Pt}\)

Short Answer

Expert verified

\({ }_{2}^{3} \mathrm{He}\): 2 protons, 1 neutron. \({ }_{2}^{4} \mathrm{He}\): 2 protons, 2 neutrons. \({ }_{12}^{24} \mathrm{Mg}\): 12 protons, 12 neutrons. \({ }_{12}^{25} \mathrm{Mg}\): 12 protons, 13 neutrons. \({ }_{22}^{48} \mathrm{Ti}\): 22 protons, 26 neutrons. \({ }_{35}^{79} \mathrm{Br}\): 35 protons, 44 neutrons. \({ }_{78}^{195} \mathrm{Pt}\): 78 protons, 117 neutrons.

Step by step solution

Identify the Atomic Number and Atomic Mass

The atomic number is the subscript number. The atomic mass is the superscript number. For example, for the species \({ }_{2}^{3} \mathrm{He}\), the atomic number is 2 and the atomic mass is 3.

Calculate the Number of Protons

The atomic number is equal to the number of protons. Thus, for the species \({ }_{2}^{3} \mathrm{He}\), it has 2 protons.

Calculate the Number of Neutrons

The number of neutrons can be calculated by subtracting the atomic number (number of protons) from the atomic mass. Thus, for the species \({ }_{2}^{3} \mathrm{He}\), it has \(3 - 2 = 1\) neutron.

Repeat for Each Species

Repeat the steps 1 through 3 for each of the other species provided. By following these steps, you can determine the number of protons and neutrons for any given species.

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For each of these species, determine the number of protons and the number of neutrons in the nucleus: \({ }_{2}^{3} \mathrm{He},{ }_{2}^{4} \mathrm{He},{ }_{12}^{24} \mathrm{Mg},{ }_{12}^{25} \mathrm{Mg},{ }_{22}^{48} \mathrm{Ti},{ }_{35}^{79} \mathrm{Br},{ }_{78}^{195} \mathrm{Pt}\)

Short Answer

Step by step solution

Identify the Atomic Number and Atomic Mass

Calculate the Number of Protons

Calculate the Number of Neutrons

Repeat for Each Species

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