EOG Vocabulary Review

Anything that has mass and takes up space

The smallest unit of an element composed of a specific number of protons, neutrons and electrons

Positively charged subatomic particles found in the nucleus of an atom.

A subatomic particle with a neutral (no) charge, that can be found in the nucleus of an atom

A negatively charged subatomic particle found in the shells surrounding the nucleus of an atom

The center of the atom, composing most of the atoms mass, and containing protons and neutrons

Orbital pathways surrounding the nucleus of the atom on which electrons travel; composes most of atoms volume

An organized chart of all the known elements arranged horizontally by increasing atomic number (protons) and vertically by similar chemical properties

The top number of an element box that indicates the number of protons (also electrons) in an atom

The bottom number in an element box, can be subtracted by the atomic number to calculate the number of neutrons

1-3 letter used to identify an element in chemical formulas and equations

Horizontal rows on the periodic table indicating the number of electron shells

Also called families, the vertical columns on the periodic tables that indicated shared chemical properties and the number of valence electrons

The electrons in the outermost shells that can be shared or exchanged to form bonds

Non reactive elements found on the far left of the periodic table, containing a full outer shell of electrons