Multiple Choice
How many protons are in an atom of cobalt (Co)?
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4. Atoms and Elements
Subatomic Particles (Simplified)
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How many protons are in an atom of bromine (Br)?
A
79
B
17
C
44
D
35
Verified step by step guidance1
Identify the element in question, which is bromine (Br). Each element is defined by its atomic number, which represents the number of protons in its nucleus.
Recall that the atomic number is unique to each element and can be found on the periodic table. For bromine, locate its position on the periodic table to find its atomic number.
Understand that the atomic number corresponds directly to the number of protons in the atom. Therefore, the number of protons in bromine is equal to its atomic number.
Note that the number 79 given in the problem is the mass number, which is the sum of protons and neutrons, not the number of protons alone.
Conclude that the correct number of protons in bromine is the atomic number, which is 35.
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