Term | Definition |
Periodic table | Table of elements |
element | identity of an atom |
element symbol | letters that represent the type of atom it is |
atomic mass | weight of atom |
atomic # | the #of protons and electrons is in the atom |
Period | horizontal row if elements |
Group | vertical row of atoms |
Family | when a group of atom share the same traits |
Chemical formula | Equasion of atoms an |
Metals | any of a class of elementary substances, as gold, silver, or copper, all of which are crystalline when solid and many of which are characterized by opacity, ductility, conductivity, and a unique luster when freshly fractured. |
nonmetals | an element not having the character of a metal, as carbon or nitrogen. |
metalloids | a nonmetal that in combination with a metal forms an alloy.
an element that has both metallic and nonmetallic properties, as arsenic, silicon, or boron. |
noble gasses | any of the chemically inert gaseous elements of group or of the periodic table: helium, neon, argon, krypton, xenon, and radon. |
Reactivity | the relative capacity of an atom, molecule, or radical to undergo a chemical reaction with another atom, molecule, or compound. |
Dimitri mendeleev | russian that created the first periodic table |
trend | when a family has the same traits on a periodic table |
energy level | the amount of reactivity an d propertys an atom has |
valance electrons | electrons that bond with eachother |
chemical property | a property or characteristic of a substance that is observed during a reaction in which the chemical composition or identity of the substance is changed: |
physical property | when the identity is not changed but is changed by physical means |