Multiple Choice
How many neutrons does lithium-8 have?
2. Atoms & Elements
Isotopes
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How many neutrons does a lithium atom with a mass number of 7 have?
A
4
B
6
C
5
D
3
Verified step by step guidance1
Understand the concept of mass number: The mass number of an atom is the sum of the number of protons and neutrons in its nucleus.
Identify the atomic number of lithium: Lithium has an atomic number of 3, which means it has 3 protons.
Use the formula to find the number of neutrons: The number of neutrons can be calculated using the formula: \( \text{Number of neutrons} = \text{Mass number} - \text{Atomic number} \).
Substitute the known values into the formula: For lithium with a mass number of 7, substitute the mass number (7) and the atomic number (3) into the formula.
Calculate the number of neutrons: Perform the subtraction \( 7 - 3 \) to find the number of neutrons in the lithium atom.
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