Isotopes and Calculating Atomic Mass
Flashcard
•
Chemistry
•
10th Grade
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
What is an isotope?
Back
Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons, resulting in different atomic masses.
2.
FLASHCARD QUESTION
Front
How do you calculate average atomic mass?
Back
To calculate average atomic mass, you need the atomic mass and percent abundance of each isotope.
3.
FLASHCARD QUESTION
Front
What is the atomic mass of an isotope?
Back
The atomic mass of an isotope is the mass of a single atom of that isotope, typically measured in atomic mass units (amu).
4.
FLASHCARD QUESTION
Front
What does percent abundance mean?
Back
Percent abundance refers to the relative amount of each isotope of an element present in a naturally occurring sample.
5.
FLASHCARD QUESTION
Front
If an element has two isotopes with masses of 10.013 amu (19.9% abundance) and 11.01 amu (80.1% abundance), what is the average atomic mass?
Back
The average atomic mass is calculated as (10.013 amu * 0.199) + (11.01 amu * 0.801) = 10.812 amu.
6.
FLASHCARD QUESTION
Front
What is the significance of neutrons in isotopes?
Back
Neutrons determine the isotope of an element; different numbers of neutrons result in different isotopes of the same element.
7.
FLASHCARD QUESTION
Front
What is the atomic number of an element?
Back
The atomic number is the number of protons in the nucleus of an atom, which defines the element.
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