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Periodic table vocab
Periodic table vocabulary
| Term | Definition |
|---|---|
| atomic mass | average mass of all the isotopes of that element |
| atomic number | number of protons in the nucleus of an atom |
| chemical symbol | one or two letter abbreviation for an element |
| periodic table | arrangement of elements showing a repeating pattern |
| neutron | particle in the nucleus that has no charge |
| period | term for the rows of the periodic table |
| nucleus | very center of the atom |
| electron | negatively charged particle that orbits the center of an atom |
| group | term for the columns of the periodic table also known as families |
| proton | positively charged particle in the nucleus of the atom |
| metal | elements that are good conductors of electricity and heat often shiny and bendable |
| luster | shiny and reflective |
| malleable | can be hammered or rolled into flat sheets or shapes |
| ductile | can pulled out or drawn into long wires |
| thermal conductivity | ability to transfer heat |
| electrical conductivity | ability to carry electrical current |
| reactivity | ease and speed with which one element combines with another |
| corrosion | deterioration of a metal due to a chemical reaction |
| alkali metals | most reactive elements, are seldom found uncombined with other atoms |
| alkaline earth metals | these metals are harder and denser and melt at higher temperatures |
| nonmetal | element that lacks most properties of a metal. mostly found on the right side of periodic table |
| diatomic molecule | two molecules of the nitrogen family are combined with each other and is not very reactive |
| halogens | means "salt forming" flourine, bromine, chlorine and iodine. very reactive |
| noble gasses | elements of group 18. Do not normally form compounds because they do not share electrons |
| metalloids | have some properties of metals and some of nonmetals. Solid at room temperature. Hard Brittle and somewhat reactive |
| semiconductors | substances that can conduct electricity under some conditions |