Multiple Choice
Which of the following is the mass number of the most common isotope of boron?
104
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2. Atoms & Elements
The Atom
Multiple Choice
How many protons are present in a neutral atom of bromine (Br)?
A
17
B
79
C
45
D
35
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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 a neutral atom is equal to the atomic number of the element.
Look up the atomic number of bromine on the periodic table; this number represents the number of protons.
Understand that the atomic number is unique to each element and defines the element's identity.
Conclude that the number of protons in a neutral bromine atom is equal to its atomic number, which is 35.
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