Isotopes and Average Atomic Mass

Front

What subatomic particles are found in the nucleus of an atom?

Back

Protons and Neutrons

Front

What is the average atomic mass of silver?

Back

107.8677 amu

Front

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

Back

85.6 amu

Front

What happens to an atom if you add a proton?

Back

It becomes a new element.

Front

Which subatomic particle is electrically neutral?

Back

Neutron

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.

Front

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

Back

Multiply the mass of each isotope by its relative abundance (as a decimal) and sum the results.

Front

What is the significance of the atomic number of an element?

Back

The atomic number determines the number of protons in an atom and defines the element.

Front

What is the difference between atomic mass and average atomic mass?

Back

Atomic mass refers to the mass of a single atom, while average atomic mass is the weighted average of all isotopes of an element.

Front

What is the role of neutrons in an atom?

Back

Neutrons contribute to the mass of an atom and help stabilize the nucleus.