Question

what is the mass number of an ion with 108 electrons, 158 neutrons, and a +1 charge?
express your answer as an integer.
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Explanation:

Step1: Find the number of protons

For a cation with a +1 charge, the number of protons \(p\) is related to the number of electrons \(e\) by the formula \(p=e + 1\). Given \(e = 108\), then \(p=108 + 1=109\).

Step2: Calculate the mass number

The mass number \(A\) is the sum of the number of protons \(p\) and neutrons \(n\). Given \(p = 109\) and \(n=158\), then \(A=p + n\). Substitute the values: \(A=109+158\).

$$A = 267$$

Answer:

\(267\)