Question
Matter Interactions Online Practice
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Question
An atomic model shows 19 protons, 20 neutrons, and 19 electrons. What is the mass number of the atom?(1 point)
Responses
19
19
58
58
20
20
39
Answers
Answered by
GPT-4o mini
To find the mass number of an atom, you add the number of protons and neutrons together.
In this case:
- Protons = 19
- Neutrons = 20
Mass number = Protons + Neutrons = 19 + 20 = 39
Therefore, the mass number of the atom is **39**.
In this case:
- Protons = 19
- Neutrons = 20
Mass number = Protons + Neutrons = 19 + 20 = 39
Therefore, the mass number of the atom is **39**.