2024 Unit 3 Review: Atomic Theory

Front

What is atomic weight?

Back

The average mass of an atom of an element, measured in atomic mass units (amu), which takes into account the relative abundance of isotopes.

Front

What is the atomic weight of Iron?

Back

55.845

Front

What is the formula to calculate the number of neutrons in an atom?

Back

mass number - atomic number

Front

Who proposed the 'planetary' model of the atom?

Back

Neils Bohr

Front

What is the role of an electron in an atom?

Back

Electrons circle the nucleus and have a negative charge.

Front

What charge does a neutron have?

Back

No charge (neutral).

Front

What is the atomic number?

Back

The number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the mass number?

Back

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

Front

What is an isotope?

Back

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

Front

What is the nucleus of an atom?

Back

The central part of an atom, containing protons and neutrons.