Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
12th Edition
ISBN: 9781259587399
Author: Eugene Hecht
Publisher: McGraw-Hill Education
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Chapter 45, Problem 18SP
To determine

The number of protons, neutrons, and electrons in the atom U92235.

Expert Solution & Answer
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Answer to Problem 18SP

Solution:

92, 143, and 92

Explanation of Solution

Given data:

The atom is represented as U92235.

Formula used:

An atom represented as XZA represents the following data,

Here, Z is the atomic number of the atom thatrepresents the number of protons in the atom. A is the atomic mass thatrepresents the sum of the number of protons and neutrons in the atom. For a neutral atom, the number of electrons is equal to the number of protons.

The calculations for the atom XZA are done by using the formula,

N=AZnp=Zne=Z

Here, np, ne, and N indicate the number of protons, electrons, and neutrons in an atom, respectively.

Explanation:

Compare the atom U92235 with the standard form of an atom XZA.

A=235Z=92

The number of protonsis equal to the atomic number. Hence, the number of protons in U92235 is 92.

Observe the notation for the atom U92235, which indicates that the atom does not have any charge. Therefore, the number of protons is equal to the number of electrons. Hence, the number of electrons in U92235 is 92.

Recall the formula to calculate the number of neutrons in the atom U92235.

N=AZ

Substitute 235 for A and 92 for Z

N=23592=143

The number of neutrons is 143.

Conclusion:

Thenumber of protons, neutrons, and electrons in the atom U92235 are 92, 143, and 92, respectively.

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