
(a)
Interpretation:
The following table of isotopes should be completed:
Concept Introduction:
Isotopes are the compounds having the same
To write an isotope symbol atomic number (Z) is written on the lower left side and atomic mass (A) is written on the upper left side of an element.

Answer to Problem 10.28P
The complete table for isotopes symbol is represented as follows:
Atomic number(Z) | Mass number(A) | Number of protons | Number of neutrons | Isotope symbol | |
Sodium-24 | 11 | 24 | 11 | 13 |
Explanation of Solution
The atomic number is equal to the number of protons in an element.
Mass number = Number of protons + Number of neutrons
The atomic number for sodium is 11 and the mass number is 24.
Since atomic number = number of protons
Thus, the number of protons in sodium is 11 and the number of neutrons in sodium can be calculated by simply subtracting the number of protons from the mass number as follows:
Therefore, the isotope symbol for Sodium is
(b)
Interpretation:
The following table of isotopes should be completed:
Concept Introduction:
Isotopes are the compounds having the same atomic number but different atomic mass.
To write an isotope symbol atomic number (Z) is written on the lower left side and atomic mass (A) is written on the upper left side of an element.

Answer to Problem 10.28P
The complete table for isotopes symbol is represented as follows:
Atomic number(Z) | Mass number(A) | Number of protons | Number of neutrons | Isotope symbol | |
b. Strotium-89 | 38 | 89 | 38 | 51 |
Explanation of Solution
The formula to determine the mass number is:
Rearranging:
Substituting the values:
Since atomic number = number of protons
Thus, the element with atomic number 38 is strontium, Sr.
Therefore, the isotope symbol for strontium is
(c)
Interpretation:
The following table of isotopes should be completed:
Concept Introduction:
Isotopes are the compounds having the same atomic number but different atomic mass.
To write an isotope symbol atomic number(Z) is written on the lower left side and atomic mass(A) is written on the upper left side of an element.

Answer to Problem 10.28P
The complete table for isotopes symbol is represented as follows:
Atomic number(Z) | Mass number(A) | Number of protons | Number of neutrons | Isotope symbol | |
c. Iron-59 | 26 | 59 | 26 | 33 |
Explanation of Solution
The mass number of element is 59.
Since atomic number = number of protons
So, the atomic number of the isotope is 26 thus, the element is iron, Fe.
Thus, the number of protons for this element is 26 and the number of neutrons in iron can be calculated by simply subtracting the number of protons from the mass number as follows:
Therefore, the isotope symbol for iron is
(d)
Interpretation:
The following table of isotopes should be completed:
Concept Introduction:
Isotopes are the compounds having the same atomic number but different atomic mass.
To write an isotope symbol atomic number(Z) is written on the lower left side and atomic mass(A) is written on the upper left side of an element.

Answer to Problem 10.28P
The complete table for isotopes symbol is represented as follows:
Atomic number(Z) | Mass number(A) | Number of protons | Number of neutrons | Isotope symbol | |
d.Samarium-153 | 62 | 153 | 62 | 91 |
Explanation of Solution
The mass number of element is 153.
The atomic number of samarium is 62.
Since atomic number = number of protons
Thus, the number of protons for this element is 62 and the number of neutrons in samarium can be calculated by simply subtracting the number of protons from the mass number as follows:
Therefore, the isotope symbol for Samarium is
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Chapter 10 Solutions
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