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2. Atoms & Elements

Atomic Mass

2. Atoms & Elements

Atomic Mass

Open Question
What is the average atomic mass of titanium on that planet?
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Open Question
Boron obtained from borax deposits in death valley consists of two isotopes. They are boron-10 and boron-11 with atomic masses of 10.013 amu and 11.009 amu, respectively. The atomic mass of boron is 10.81 amu (see periodic table). Which isotope of boron is more abundant, boron-10 or boron-11?
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Multiple Choice
How is the average atomic mass of an element calculated?
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?
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Multiple Choice
Element A has two isotopes. The first isotope is present 24.01% of the time and has a mass of 131.96 amu. The second isotope has a mass of 113.66 amu. Calculate the atomic mass of element A.
Open Question
Calculate the atomic mass of element ""X"", if it has 2 naturally occurring isotopes with the following masses and natural abundances:
X-45 44.8776 amu 32.88%
X-47 46.9443 amu 67.12%.
Multiple Choice
An element has two naturally occurring isotopes. Isotope 1 has a mass of 120.9038 amu and a relative abundance of 57.4%, and isotope 2 has a mass of 122.9042 amu with a relative abundance of 42.6%. Calculate the atomic mass of this element and identify it.