QQuestionChemistry
QuestionChemistry
"How many protons, neutrons, and electrons are present in an atom of gold (Au) with a mass number of 197?
A. 197 protons, 276 neutrons, 79 electrons
B. 79 protons, 118 neutrons, 79 electrons
C. 79 protons, 197 neutrons, 118 electrons
D. 118 protons, 72 neutrons, 118 electrons"
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Answer
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Step 1Let's solve this step by step:
Step 2: Understand the atomic structure
- For any atom, the number of protons determines the element's identity - The atomic number represents the number of protons - Mass number = number of protons + number of neutrons - In a neutral atom, the number of electrons equals the number of protons
Final Answer
B. 79 protons, 118 neutrons, 79 electrons
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