Mastering Weighted Averages and Atomic Weight Calculations Quiz

Atomic mass is the average mass of all the different forms of an element that exist on the planet. Atomic number is the number of protons found in an atom. Atomic weight is the weighted average of all naturally occurring isotopes of an element.

Average atomic mass of an element is calculated by considering the weighted average of all naturally occurring isotopes of an element. It is found by multiplying the mass number of each isotope by its percent abundance, and then summing up these values.

The atomic number represents the number of protons found in an atom. It is also the most critical piece of information that exists about an atom.

No, the atomic number of an element will never change. It is always equal to the number of protons in the atom.

1 amu

2 amu

3 amu

1.0079 amu

The relative abundances of each isotope of that element.

Very close to 1 or 1.0079 amu.

6.941 amu.

Lithium-7.

The mass number of an atom is found by adding the number of protons and the number of neutrons in that atom.

Atomic mass is defined as the weighted average of all of the naturally occurring isotopes of an element.

Isotopes are atoms of the same element that have a different number of neutrons in their nucleus.

Atomic mass and atomic weight are terms that are often used interchangeably and have no discernible difference in their definitions.

The formula for calculating the atomic weight of an element is obtained by multiplying each percent abundance by the corresponding mass number and then adding up the resulting products.

An isotope of an element is a different form of an atom that exists with varying numbers of neutrons.

The average atomic mass is the weighted average of the masses of all the isotopes of a particular element, taking into consideration the percent abundance of each naturally occurring isotope.

The mass of a hydrogen atom depends on the isotope. The most common isotope, protium, has a mass of about 1 amu. Deuterium has a mass of about 2 amu, and tritium has a mass of about 3 amu.