Multiple Choice
In order to determine if two atoms are copper (Cu) atoms, which property must they have in common?
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2. Atoms & Elements
Isotopes
Multiple Choice
A neutral argon atom with a mass number of 40 has how many neutrons?
A
18
B
22
C
40
D
20
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Verified step by step guidance1
Identify the given information: The argon atom is neutral and has a mass number (A) of 40.
Recall that the mass number (A) is the sum of protons (Z) and neutrons (N) in the nucleus: \(A = Z + N\).
Determine the atomic number (Z) of argon, which is the number of protons. Argon has an atomic number of 18.
Use the formula to find the number of neutrons: \(N = A - Z\).
Substitute the values: \(N = 40 - 18\) to find the number of neutrons.
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