Isotopes

Front

What is an isotope?

Back

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

Front

How is atomic mass calculated using isotopes?

Back

Atomic mass is calculated by taking the weighted average of the masses of an element's isotopes, based on their relative abundances.

Front

What is the mass number of an atom?

Back

The mass number is the total number of protons and neutrons in the nucleus of an atom.

Front

What is the difference between atomic number and mass number?

Back

The atomic number is the number of protons in an atom, while the mass number is the sum of protons and neutrons.

Front

If an element has 12 protons and 13 neutrons, what is its isotope notation?

Back

The isotope notation is Mg-25.

Front

What is the average atomic mass of an element with two isotopes, 85Rb (72.2%) and 87Rb (27.8%)?

Back

The average atomic mass is 85.6 amu.

Front

How do you determine the number of neutrons in an isotope?

Back

Subtract the atomic number (number of protons) from the mass number.

Front

What is the significance of isotopes in chemistry?

Back

Isotopes are important for understanding nuclear reactions, dating materials, and medical applications.

Front

What is the isotope notation for an element with 9 protons and 9 neutrons?

Back

The isotope notation is Fluorine-18.

Front

How do isotopes affect the atomic mass of an element?

Back

The presence of isotopes with different masses affects the average atomic mass of the element.