Multiple Choice
Titanium-48 is an isotope of titanium. How many protons does a neutral atom of have?
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4. Atoms and Elements
Isotopes
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Copper has atomic number 29. How many neutrons are in an atom of the isotope copper-63?
A
34
B
29
C
92
D
63
Verified step by step guidance1
Identify the atomic number of copper, which is given as 29. The atomic number represents the number of protons in the nucleus of the atom.
Recognize that the isotope notation copper-63 indicates the mass number of this isotope is 63. The mass number is the total number of protons and neutrons in the nucleus.
Recall the relationship between mass number (A), number of protons (Z), and number of neutrons (N):
\[ A = Z + N \]
Rearrange the formula to solve for the number of neutrons:
\[ N = A - Z \]
Substitute the known values (mass number 63 and atomic number 29) into the equation to find the number of neutrons.
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