An Atom Has an Atomic Number of 18 and a Mass

question 42

Multiple Choice

An atom has an atomic number of 18 and a mass number of 38.Letting P = the number of protons and N = the number of neutrons, which of the following atoms is the isotope of this atom?

• A)P = 18, N = 20
• B)P = 18, N = 21
• C)P = 20, N = 18
• D)none of the above

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