Isotopes

Front

What is an isotope?

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons, resulting in different atomic masses.

Front

How do you calculate the average atomic mass of an element with multiple isotopes?

Back

The average atomic mass is calculated by multiplying the mass of each isotope by its relative abundance (as a decimal), then summing these values.

Front

What is the atomic mass of copper if 69.2% is copper-65 and 30.8% is copper-63?

Back

64.4 amu.

Front

How many neutrons are in nickel-59?

Back

31 neutrons.

Front

What is the average atomic mass of rubidium with 72.2% of 85Rb and 27.8% of 87Rb?

Back

85.6 amu.

Front

How many neutrons are in potassium-39?

Back

20 neutrons.

Front

What is the isotope symbol for Fluorine-18?

Back

The isotope symbol is 18F.

Front

What is the relationship between protons, neutrons, and atomic mass?

Back

The atomic mass of an element is approximately equal to the sum of its protons and neutrons.

Front

What is the significance of isotopes in medicine?

Back

Isotopes are used in medical imaging and treatment, such as radioactive isotopes in cancer therapy.

Front

What is the difference between stable and unstable isotopes?

Back

Stable isotopes do not change over time, while unstable isotopes (radioisotopes) decay into other elements.