Multiple Choice
What is the mass number of an atom of nitrogen that contains 8 neutrons?
2. Atoms & Elements
Isotopes
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Which of the following statements best describes isotopes?
A
Isotopes are atoms of the same element with different numbers of protons.
B
Isotopes are atoms of different elements with the same atomic number.
C
Isotopes are atoms of the same element with different numbers of neutrons.
D
Isotopes are atoms of different elements with the same number of electrons.
Verified step by step guidance1
Understand the definition of isotopes: Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.
Recall that the number of protons in an atom defines the element and is known as the atomic number.
Recognize that isotopes of an element have the same atomic number because they have the same number of protons.
Identify that the difference in isotopes lies in the number of neutrons, which affects the atomic mass but not the chemical properties.
Evaluate the given statements: The correct description of isotopes is that they are atoms of the same element with different numbers of neutrons.
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