Average Atomic Mass

What is an isotope?

• Atoms of different elements that have the same number of protons.

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

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

• Atoms that are chemically identical but have different atomic masses.

How do you calculate average atomic mass?

• Add the atomic masses of all isotopes together and divide by the number of isotopes.

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

• Take the most abundant isotope's mass as the average atomic mass.

• Calculate the average of the atomic numbers of all isotopes.

What is the atomic mass of Oxygen-16?

• 14 amu

• 16 amu

• 18 amu

• 12 amu

What is the relationship between protons, neutrons, and atomic mass?

• The atomic mass is equal to the number of protons only.

• The atomic mass is equal to the number of neutrons only.

• The atomic mass of an element is approximately equal to the sum of its protons and neutrons.

• The atomic mass is unrelated to protons and neutrons.

How do isotopes of an element differ?

• They differ in the number of protons, which affects their chemical properties.

• They differ in the number of electrons, which affects their charge.

• They differ in the number of neutrons, which affects their mass but not their chemical properties.

• They differ in their atomic number, which affects their identity as an element.

What is average atomic mass?

• The total mass of an element's isotopes combined.

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

• The mass of the most abundant isotope of an element.

• The average mass of all atoms in a molecule.

What is the significance of the atomic number?

• It represents the number of protons in an atom and determines the element's identity.

• It indicates the number of neutrons in an atom.

• It determines the mass of the atom.

• It represents the number of electrons in an atom.

What is the average atomic mass of Boron?

• 9.0 amu

• 10.8 amu

• 11.2 amu

• 12.0 amu

How can you identify an element using its average atomic mass?

• By comparing the calculated average atomic mass to values listed in the periodic table.

• By measuring the element's density and comparing it to known values.

• By analyzing the element's color and physical state at room temperature.

• By determining the element's position in the periodic table based on its atomic number.

What is the significance of the atomic mass unit (amu)?

• It is a standard unit of mass that quantifies mass on an atomic or molecular scale, defined as one twelfth of the mass of a carbon-12 atom.

• It is a unit used to measure the energy of atoms in nuclear reactions.

• It is a measure of the volume occupied by an atom in a molecule.

• It is a standard unit for measuring the temperature of gases.