2. Atoms & Elements
Atomic Mass
Practice this topic
- Multiple Choice
Which of the following choices has the greatest atomic mass?
3871views19rank1comments - Multiple Choice
Neon possesses three naturally occurring isotopes. 20Ne has a percent abundance of 90.48% and an isotopic mass of 19.99244 amu, 21Ne has a percent abundance of 0.27% and an isotopic mass of 20.99384 amu, and 22Ne has a percent abundance of 9.25%. What is the isotopic mass of the 22Ne isotope?
1526views - Multiple Choice
Three isotopic forms of potassium exist: 39K, 40K and 41K. Potassium has an atomic mass of 39.0983 amu. Potassium-40 has an isotopic mass of 39.9640 amu and natural abundance of 0.0117%. Potassium-41 has an isotopic mass of 40.9618 amu and natural abundance of 6.7302%. What is the isotopic mass of Potassium-39?
2523views10rank1comments - Multiple Choice
Neon possesses three naturally occurring isotopes. 20Ne has a percent abundance of 90.48% and an isotopic mass of 19.99244 amu, 21Ne has a percent abundance of 0.27% and an isotopic mass of 20.99384 amu, and 22Ne has a percent abundance of 9.25%. What is the isotopic mass of the 22Ne isotope?
1331views11rank - Textbook Question
The following diagram is a representation of 20 atoms of a fictitious element, which we will call nevadium (Nv). The red spheres are 293Nv, and the blue spheres are 295Nv. (b) If the mass of 293Nv is 293.15 u and that of 295Nv is 295.15 u, what is the atomic weight of Nv?
511views1rank - Textbook Question
The following diagram is a representation of 20 atoms of a fictitious element, which we will call nevadium (Nv). The red spheres are 293Nv, and the blue spheres are 295Nv. (a) Assuming that this sample is a statistically representative sample of the element, calculate the percent abundance of each element.
1477views - Textbook QuestionWhat is the atomic weight of an element that consists of two naturally occurring isotopes? The first isotope has a mass of 84.911 and an abundance of 72.17% and the second isotope has a mass of 86.909 and an abundance of 27.83%. (LO 2.15)(a) 85.47 (b) 86.35 (c) 85.91 (d) 85.171045views
- Textbook Question
(a) What isotope is used as the standard in establishing the atomic mass scale?
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