Multiple Choice
Gallium has two naturally occurring isotopes: Ga-69 with a mass of 68.9256 amu and a natural abundance of 60.11%, and Ga-71. If the atomic mass of gallium is 69.723 amu, what is the mass of Ga-71?
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2. Atoms & Elements
Isotopes
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How many neutrons does a typical lithium atom have?
A
3
B
5
C
6
D
4
Verified step by step guidance1
Identify the atomic number of lithium, which is 3. This number represents the number of protons in the nucleus of a lithium atom.
Determine the atomic mass of lithium. The most common isotope of lithium has an atomic mass of approximately 7.
Use the formula to find the number of neutrons: \( \text{Number of neutrons} = \text{Atomic mass} - \text{Atomic number} \).
Substitute the values into the formula: \( \text{Number of neutrons} = 7 - 3 \).
Calculate the result from the formula to find the number of neutrons in a typical lithium atom.
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