Term | Definition |
Periodic Table | Table of all the elements |
Element | pure substance that cannot be broken down into smaller peices |
Atomic Mass | The nucleus of an atom contains nearly all of an atom’s mass. An atom’s nucleus is made up of protons and neutrons. Atomic mass is approximately equal to the total number of protons and neutrons in the nucleus of an atom. |
Atomic Number | All elements are made of atoms. Each atom has a nucleus that contains particles called protons. Protons carry a positive charge. The atomic number of an element is equal to the number of protons in the nucleus. |
Period | Horizontal row on the periodic table. |
Group | Related elements. |
Family | Vertical row on the periodic table |
Metals | Solids on the periodic table. |
Metalloids | Semi-Metals on the periodic table. |
Nonmetals | Gases/Liquids on the periodic table. |
Noble Gases | Far right vertical column on the periodic table. |
Reactivity | How reactive an element is. |
Dmitri Mendeleev | Scientist who created the periodic table. |
Trend | Similarities of elements as they continue. |
Energy Level | How high or low the energy is. |
Valence Electrons | In chemistry, a valence electron is an electron that is associated with an atom, and that can participate in the formation of a chemical bond; in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair |
Chemical Property | A chemical property is any of a material's properties that becomes evident during, or after, a chemical reaction; that is, any quality that can be established only by changing a substance's chemical identity. |
Physical Property | Physical properties can be observed or measured without changing the composition of matter. Physical properties are used to observe and describe matter. |