Multiple Choice
The atomic number of boron is 5. What is the mass number of a boron atom that contains 4 neutrons?
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2. Atoms & Elements
The Atom
Multiple Choice
How many protons are present in an atom of bromine (Br)?
A
35
B
45
C
79
D
17
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Verified step by step guidance1
Identify the element in question, which is bromine (Br).
Recall that the number of protons in an atom is equal to the atomic number of the element.
Look up the atomic number of bromine on the periodic table; this number is unique to each element and represents the number of protons.
Note that the atomic number of bromine is 35, meaning every bromine atom has 35 protons.
Therefore, the number of protons in an atom of bromine is 35.
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