Multiple Choice
An atom has protons and neutrons. Which element (and isotope) is it?
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4. Atoms and Elements
Isotopes
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Which of the following is an isotope of lithium?
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Verified step by step guidance1
Understand that isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.
Identify the element by its chemical symbol; isotopes must have the same symbol (e.g., Li for lithium).
Look at the given options and focus on those with the symbol 'Li' since isotopes must be of the same element.
Compare the mass numbers (the subscript numbers) of the lithium options to see which differ in neutron count but share the same proton number.
Recognize that the isotope of lithium will have the symbol 'Li' and a different mass number than the most common lithium isotope, which is \(\mathrm{Li}_7\).
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