Multiple Choice
Which isotope of platinum contains 118 neutrons? (Platinum has atomic number .)
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4. Atoms and Elements
Isotopes
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Which neutral isotope has 17 electrons and 18 neutrons?
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Verified step by step guidance1
Recall that a neutral atom has an equal number of protons and electrons. Since the atom has 17 electrons, it must also have 17 protons.
Identify the element by its atomic number, which is the number of protons. Look up the element with atomic number 17 on the periodic table; this element is chlorine (Cl).
Determine the mass number (A) of the isotope using the formula: \(A = \text{number of protons} + \text{number of neutrons}\).
Substitute the known values: \(A = 17 + 18\) to find the mass number of the isotope.
Express the isotope notation as \(^{A}\text{Cl}\), where \(A\) is the mass number calculated in the previous step.
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