Calculating Average Atomic Mass ~ Review 2024

Front

What is average atomic mass?

Back

The weighted average of the masses of an element's isotopes, taking into account their relative abundances.

Front

How do you calculate average atomic mass?

Back

Multiply the mass of each isotope by its relative abundance (as a decimal), then sum these values.

Front

What is the significance of atomic number in identifying elements?

Back

The atomic number represents the number of protons in an atom, which defines the element.

Front

What is an isotope?

Back

Atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

How does the abundance of isotopes affect average atomic mass?

Back

Isotopes with higher abundance have a greater impact on the average atomic mass.

Front

What is the average atomic mass of Iron (Fe) based on its isotopes?

Back

55.9 amu, calculated from the isotopes Iron-54, Iron-56, and Iron-57.

Front

What is the relationship between protons and the identity of an element?

Back

The number of protons determines the element's identity; different elements have different numbers of protons.

Front

If an element has 33 protons, what is its identity?

Back

It is arsenic (As), which has an atomic number of 33.

Front

What does it mean if two atoms have the same mass number but different atomic numbers?

Back

They are different elements; mass number is the sum of protons and neutrons, while atomic number is the number of protons.

Front

How do you determine the average atomic mass of an unknown element from its isotopes?

Back

Use the formula: (mass1 * abundance1) + (mass2 * abundance2) + ... and divide by 100.