Multiple Choice
Deuterium is an isotope of hydrogen with a mass number of 2. Which of the following correctly describes a deuterium atom?
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2. Atoms & Elements
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Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many protons are present in the isotope lithium-6?
A
6
B
4
C
3
D
2
Verified step by step guidance1
Recall that the number of protons in an atom is defined by its atomic number, which is unique to each element.
Identify the element in question: lithium. Lithium has an atomic number of 3, meaning it has 3 protons.
Understand that the isotope notation lithium-6 indicates the mass number, which is the sum of protons and neutrons, but does not affect the number of protons.
Therefore, regardless of the isotope (lithium-6 or lithium-7), the number of protons remains the same as the atomic number of lithium, which is 3.
Conclude that the number of protons in lithium-6 is 3.
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