Multiple Choice
Two atoms that are isotopes of one another must have the same number of which subatomic particle?
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2. Atoms & Elements
Isotopes
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A typical atom of neon has an atomic number of 10 and a mass number of 20. How many neutrons does it contain?
A
10
B
12
C
20
D
10
Verified step by step guidance1
Identify the atomic number of neon, which is given as 10. The atomic number represents the number of protons in the nucleus of the atom.
Identify the mass number of neon, which is given as 20. 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 into the equation: \(N = 20 - 10\), which gives the number of neutrons in the neon atom.
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