Two isotopes of an element have 17 protons with 18 neutrons and 20 neutrons, respectively. Which of the following is the correct representation of these isotopes?
\(^{35}_{17}\text{Cl and }^{37}_{17}\text{Cl}\)
Both isotopes have the same atomic number (17 protons), so both are Chlorine (Cl), written as the subscript.
Mass number equals protons plus neutrons: \(17+18=35\) and \(17+20=37\), written as the superscript.
So the isotopes are correctly represented as \(^{35}_{17}\text{Cl}\) and \(^{37}_{17}\text{Cl}\).
Hence, the correct representation is \(^{35}_{17}\text{Cl and }^{37}_{17}\text{Cl}\).
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