Relier Pairs Periodic Table Vocabulary (D)Version en ligne Use what you learned from your vocabulary flashcards. par Lydia Lawrence 1 Bohr model 2 Proton 3 Atomic Mass 4 Element 5 Atom 6 Atomic Number 7 Period 8 Electron 9 Neutron 10 Group A basic visual of a single atom with protons, neutrons, and electrons on energy levels. This model was designed by Neils Bohr. The smallest unit a substance can be divided into and still hold the properties of that substance. A substance made of one type of atom found on the periodic table. These substances make up everything in the universe. The horizontal rows found on a periodic table. A subatomic particle located on energy levels that has a negative charge. The average mass of the protons plus the neutrons in an atom's nucleus. A subatomic particle located in the nucleus with a neutral, or no, charge. A subatomic particle located in the nucleus with a positive charge. A vertical column on the periodic table. It is also known as a family. The number of protons and the number of electrons found in one atom of an element.