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Which of the following elements is the least abundant in the Earth's crust?
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2. Atoms & Elements
Isotopes
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How many neutrons are in a typical lithium atom with an atomic mass of 7?
A
7
B
10
C
3
D
4
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Identify the atomic number of lithium, which is 3. This tells us the number of protons in a lithium atom.
Understand that the atomic mass of lithium is given as 7. This is the sum of the number of protons and neutrons in the atom.
Use the formula: \( \text{Number of neutrons} = \text{Atomic mass} - \text{Atomic number} \).
Substitute the known values into the formula: \( \text{Number of neutrons} = 7 - 3 \).
Calculate the result to find the number of neutrons in a typical lithium atom.
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