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Question
\[\ce{^197_79Au}\] contains ______.
Options
79 protons and 118 neutrons
79 neutrons and 118 protons
197 protons and 118 neutrons
79 protons and 197 neutrons
MCQ
Fill in the Blanks
Solution
\[\ce{^197_79Au}\] contains 79 protons and 118 neutrons.
Explanation:
Number of protons = Atomic number = 79
Number of neutrons = Atomic mass number - Atomic number
= 197 - 79 = 118
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