Multiple Choice
A sample of copper has a mass of 63.5 g. How many atoms of copper are present in the sample?
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2. Atoms & Elements
The Atom
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many protons are present in a carbon-12 atom?
A
6
B
8
C
12
D
4
Verified step by step guidance1
Recall that the number of protons in an atom is given by its atomic number, which is unique for each element.
Identify the element in the problem: carbon-12. The 'carbon' part tells us the element, and the '-12' refers to the mass number (sum of protons and neutrons).
Look up the atomic number of carbon, which is 6. This means every carbon atom has 6 protons.
Understand that the mass number (12 in carbon-12) is the total number of protons plus neutrons, but the number of protons remains constant for the element.
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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