Question

part a
what is the mass number of an ion with 109 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 positively - charged ion (\(M^{+1}\)), the number of protons (\(p\)) is related to the number of electrons (\(e\)) by the formula \(p=e + \text{charge}\). Given \(e = 109\) and charge \(=+ 1\), then \(p=109 + 1=110\).

Step2: Calculate the mass number

The mass number (\(A\)) is the sum of the number of protons (\(p\)) and neutrons (\(n\)). Given \(p = 110\) and \(n=158\), then \(A=p + n\). Substitute the values: \(A=110+158 = 268\).

Answer:

\(268\)