Scelta multipla
Gold has an atomic number of 79 and a mass number of 197. How many neutrons does a typical atom of gold contain?
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2. Atoms & Elements
The Atom
Scelta multipla
How many neutrons are present in a typical atom of fluorine-19?
A
19
B
9
C
10
D
1
Guida verificata passo dopo passo1
Identify the atomic number (Z) of fluorine, which is the number of protons in the nucleus. For fluorine, Z = 9.
Recognize that the number 19 in fluorine-19 represents the mass number (A), which is the total number of protons and neutrons in the nucleus.
Use the relationship between mass number, protons, and neutrons: \(A = Z + N\), where \(N\) is the number of neutrons.
Rearrange the formula to solve for neutrons: \(N = A - Z\).
Substitute the known values: \(N = 19 - 9\), which gives the number of neutrons in fluorine-19.
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