2. Atoms & Elements

Isotopes

Multiple Choice
Which of the following isotopes would you expect to be stable?
Multiple Choice
An isotope of sodium (Na) has a mass number of 22. How many neutrons does it have?
Multiple Choice
How many neutrons does a lithium (Li) atom typically have?
Multiple Choice
Bismuth has an atomic number of 83 and its most common isotope has a mass number of 209. How many neutrons are present in this isotope of bismuth?
Multiple Choice
An atom of the isotope Cs contains how many protons (p)?
Multiple Choice
Which pair of atoms constitutes a pair of isotopes of the same element?
Multiple Choice
How many protons are present in an isotope of sodium with a mass number of 25?
Open Question
What is the mass number of the isotope with the symbol ³⁷₁₇Cl?
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Multiple Choice
Why did Hershey and Chase use the isotopes 32P and 35S in their experiments?
Open Question
One isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope?
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Open Question
Two isotopes of the same element will have the same number of _____ but a different number of ____.
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Open Question
An isotope of yttrium has 39 protons and 59 neutrons. What is the mass number of that isotope?
Multiple Choice
A sample of chlorine weighing 20.57 grams contains two naturally occurring isotopes: Cl-35 and Cl-37. If the atomic masses are 34.9689 amu for Cl-35 and 36.9659 amu for Cl-37, and the natural abundance of Cl-35 is approximately 75.78%, what is the mass of Cl-35 in the sample?
Open Question
Can two atoms with the same mass number ever be isotopes of each other?
Open Question
Which of these refers to atoms with the same atomic number but different atomic masses?
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