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