Multiple Choice
Which term describes atoms of the same element that have different numbers of neutrons?
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4. Atoms and Elements
Isotopes
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Which isotope of platinum contains 118 neutrons? (Platinum has atomic number .)
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Verified step by step guidance1
Recall that the atomic number (Z) of an element represents the number of protons in its nucleus. For platinum, Z = 78.
Understand that the mass number (A) of an isotope is the total number of protons and neutrons in the nucleus, so \(A = Z + N\), where \(N\) is the number of neutrons.
Since the problem states the isotope contains 118 neutrons, use the formula to find the mass number: \(A = 78 + 118\).
Calculate the mass number (without giving the final number) to identify the isotope notation as \(^{A}Pt\), where \(A\) is the sum of protons and neutrons.
Match the calculated mass number with the given isotope options to determine which isotope of platinum contains 118 neutrons.
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