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How many neutrons are present in the most abundant isotope of boron?
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2. Atoms & Elements
The Atom
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How many neutrons are present in an atom of lead (Pb) with a mass number of 208?
A
82
B
48
C
208
D
126
Guida verificata passo dopo passo1
Identify the atomic number (Z) of lead (Pb), which is the number of protons in the nucleus. For lead, Z = 82.
Note the mass number (A) given in the problem, which is the total number of protons and neutrons in the nucleus. Here, A = 208.
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: \(N = 208 - 82\), which will give the number of neutrons in the lead atom.
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