Scelta multipla
Chlorine has two main isotopes: 35^{17}Cl and 37^{17}Cl. Which isotope is the most abundant in nature?
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2. Atoms & Elements
Isotopes
Scelta multipla
If an isotope of lithium contains 5 neutrons, what is its mass number?
A
5
B
8
C
7
D
3
Guida verificata passo dopo passo1
Recall that the mass number of an isotope is the sum of the number of protons and neutrons in its nucleus.
Identify the number of protons in lithium. Since lithium's atomic number is 3, it has 3 protons.
Note the number of neutrons given in the problem, which is 5 neutrons.
Calculate the mass number by adding the number of protons and neutrons: \(\text{mass number} = \text{protons} + \text{neutrons}\).
Substitute the values: \(\text{mass number} = 3 + 5\) to find the mass number of the lithium isotope.
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