Multiple Choice
Why are atoms electrically neutral under normal conditions?
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2. Atoms & Elements
The Atom
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many neutrons are present in a neutral atom of bromine (Br) with a mass number of 80?
A
80
B
44
C
35
D
45
Verified step by step guidance1
Identify the atomic number (Z) of bromine (Br), which is the number of protons in the atom. For bromine, Z = 35.
Note the mass number (A) given in the problem, which is the total number of protons and neutrons in the nucleus. Here, A = 80.
Recall the relationship between mass number, protons, and neutrons: \(A = Z + N\), where \(N\) is the number of neutrons.
Rearrange the formula to solve for the number of neutrons: \(N = A - Z\).
Substitute the known values into the equation: \(N = 80 - 35\), which will give the number of neutrons in the bromine atom.
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