The positively charged central core of an atom

 The system of electrons surround the nuclear of an atom.

a representation of an idea, object or process that cannot be experienced directly.

A structural model of an atom created by Niels Bohr in 1913; this model shows the electrons traveling around the nucleus of an atom in different levels of circular orbits known as shells.

Also known as an electron dot structure is a model of an atom represented by the atoms Atomic Symbol and dots for each of the elements valance electrons.

The columns on the periodic table.

The rows on the periodic table

a substance that cannot be broken down into a simpler substance. The fundamental material that all matter is made of.

Smaller than or occurring within an atom.

The subatomic particle found in the center of the atom that is neutral in charge.

Positively charged subatomic particle located at the center of an atom.

The Electrons found in the outer layer(shell) of the electron cloud.

Negatively charged subatomic particle located in the electron cloud.

A characteristic of a substance that can only be detected as a result of a chemical reaction. (Ex. Flammability, corrosion resistance, radioactive decay)

A characteristic of a substance that can be observed and measured without changing the identity of the substance. (Ex. Color, hardness, boiling point)

One of four principle conditions in which matter exists (Solid, Liquid, gas, and Plasma)

The mass of an atom, usually the equivalent of the number of protons and neutrons in the atom.

The number of protons in the nucleus of that atom of any given element.

An arrangement of all the chemical elements into rows and columns.

A one or two letter abbreviation of an element.