Average Atomic Mass

Front

What are isotopes?

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.

Front

How do isotopes of the same element differ?

Back

Isotopes of the same element differ in their mass due to the different number of neutrons.

Front

What is the average atomic mass?

Back

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

Front

If an element has two isotopes, one with a mass of 10.013 amu and 19.9% abundance, and another with a mass of 11.01 amu and 80.1% abundance, how do you calculate the average atomic mass?

Back

Average atomic mass = (10.013 amu * 0.199) + (11.01 amu * 0.801) = 10.812 amu.

Front

Which isotope of chlorine is more abundant if the atomic mass is 35.45?

Back

Cl-35 is more abundant than Cl-37.

Front

What is the significance of the atomic number in isotopes?

Back

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

Front

How many protons does an element with 33 protons have?

Back

The element has an atomic number of 33, which corresponds to arsenic (As).

Front

What does amu stand for?

Back

amu stands for atomic mass unit, a standard unit of mass that quantifies mass on an atomic or molecular scale.

Front

What is the relationship between isotopes and average atomic mass?

Back

The average atomic mass of an element is influenced by the masses and relative abundances of its isotopes.

Front

Can isotopes of an element have different chemical properties?

Back

No, isotopes of an element have the same chemical properties because they have the same number of protons and electrons.