Question

part a
the only known atom that does not contain a neutron is one of the isotopes of hydrogen. the mass number, symbolized as a in the text, of this hydrogen isotope must be:
0
2
1.01
1
none of the above
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Explanation:

Step1: Recall the formula for mass number

The mass number \(A\) of an atom is given by \(A = number\ of\ protons+number\ of\ neutrons\).

Step2: Determine the number of protons and neutrons for the hydrogen isotope

For hydrogen, the number of protons \(p = 1\). Since this isotope has no neutrons (\(n=0\)).

Step3: Calculate the mass number

Using the formula \(A=p + n\), substitute \(p = 1\) and \(n = 0\). So \(A=1+0=1\).

Answer:

1