Average Atomic Mass with Isotopes

Front

What is average atomic mass?

Back

The weighted average mass of an element's isotopes, measured in atomic mass units (amu).

Tags

NGSS.HS-PS1-8

Front

What are isotopes?

Back

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

Front

How do you identify isotopes of an element?

Back

Isotopes can be identified by their mass number, which is the sum of protons and neutrons.

Front

What is the mass number of an isotope?

Back

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

Front

If an element has an atomic number of 6, what is its identity?

Back

It is Carbon.

Tags

NGSS.HS-PS1-1

Front

What is the relationship between isotopes and atomic number?

Back

Isotopes of an element have the same atomic number but different mass numbers.

Front

How do you calculate average atomic mass from isotopes?

Back

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

Tags

NGSS.HS-PS1-8

Front

What is the average atomic mass of an element with 4.35% of mass 39.946 amu, 83.79% of mass 41.941 amu, 9.50% of mass 42.941 amu, and 2.36% of mass 43.939 amu?

Back

41.97 amu.

Front

What do isotopes of carbon have in common?

Back

They have the same atomic number and different mass numbers.

Front

What is the significance of neutrons in isotopes?

Back

Neutrons determine the isotope's mass and stability but do not affect the chemical properties.

Tags

NGSS.HS-PS1-8