2. Atoms & Elements

Which of the following choices has the greatest atomic mass?

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?

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?

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?

Boron has two isotopes, boron-10 and boron-11, whose percentage abundances are 19.8% and 80.2% respectively. the atomic masses of boron-10 and boron-11 are 10.0129 amu and 11.0093 amu respectively. write the symbols for the two isotopes of boron and determine the relative atomic mass.

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?

Lithium has an elemental atomic mass of 6.941 u and has two naturally occurring isotopes, ⁶Li and ⁷Li. Their masses are 6.0151 u and 7.0160 u respectively. What are the natural abundances (to 2 decimal places in percentage) of the isotopes of lithium?

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%.

Based on these data, what is the average atomic mass of element B? 10.01 10.51 10.81 11.01

An increase in atomic number is related to an increase in atomic mass because –