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