Matching Pairs Vocab #11-18Online version PT vocab by Sarah Kniss 1 METAL: Elements that are metals have 3 valence electrons or fewer. 2 PERIOD: Hydrogen and helium are both located in the top period of the periodic table. 3 NONMETAL: Helium, oxygen, and fluorine are examples of nonmetals. 4 MENDELEEV: Mendeleev's contribution was critical to the field of chemistry. 5 GROUP: Boron and aluminum are both in group 13 on the periodic table. 6 METALLOID: Silicon is an example of a metalloid because it has some properties of metals and others of nonmetals. 7 FAMILY: Carbon and silicon are in the same family in the periodic table. 8 PERIODIC: The days of the week are periodic. vertical column on the periodic table scientist who arranged elements into a table and used it to predict unknown elements another name for a group on the periodic table element on the right side of the zigzag line on the periodic table repeating in a pattern element on the left side of the zigzag line on the periodic table horizontal row on the periodic table element bordering the zigzag line on the periodic table