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What is the mass number for an atom of osmium containing 76 protons and 113 neutrons?
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2. Atoms & Elements
The Atom
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How many protons are present in an atom of carbon-12?
A
12
B
8
C
6
D
4
Guida verificata passo dopo passo1
Recall that the number of protons in an atom is given by its atomic number, which is unique to each element.
Identify the element in the problem: carbon-12 refers to the isotope of carbon with a mass number of 12.
Understand that the atomic number of carbon is 6, meaning every carbon atom has 6 protons regardless of the isotope.
Note that the mass number (12 in carbon-12) is the sum of protons and neutrons, but it does not affect the number of protons.
Therefore, the number of protons in a carbon-12 atom is equal to the atomic number of carbon, which is 6.
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