Multiple Choice
Which of the following isotopes is not possible (i.e., would correspond to an element that cannot exist because its atomic number would be 0)?
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4. Atoms and Elements
Isotopes
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A typical neon atom is the most abundant isotope, neon-20. How many neutrons does a atom have?
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Verified step by step guidance1
Identify the atomic number of neon, which is the number of protons in the nucleus. For neon, the atomic number is 10.
Understand that the isotope notation \(^{20}Ne\) indicates the mass number (A) is 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-20 atom.
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