Unit 3 - The Atom Review

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element. It consists of a nucleus made of protons and neutrons, surrounded by electrons.

Front

What is the nucleus of an atom?

Back

The nucleus is the central part of an atom, containing protons and neutrons. It is positively charged due to the presence of protons.

Front

Who proposed the atomic theory?

Back

John Dalton proposed the atomic theory, which states that all matter is made up of atoms, which are indivisible and indestructible.

Front

What is the charge of an electron?

Back

An electron has a negative charge of -1.

Front

What is the charge of a proton?

Back

A proton has a positive charge of +1.

Front

What is the charge of a neutron?

Back

A neutron has no charge; it is neutral.

Front

What is the electron configuration of an element?

Back

The electron configuration of an element describes the distribution of electrons in its atomic orbitals.

Front

What is a noble gas configuration?

Back

A noble gas configuration refers to the electron configuration of an atom that is similar to that of the nearest noble gas, indicating a full outer shell.

Front

What is the significance of the atomic number?

Back

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

Front

What is isotopes?

Back

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