Term | Definition |
Atomic Mass | Average mass of one atom of an element |
Periodic Table | A chart where all elements are organized into periods and groups according to their properties |
Period | A row of elelments in the periodic table arranged by atomic number |
Chemical Symbol | One or two-letter code that stands for an element |
Group | Column of elements in the periodic table, which have certain properties in common |
Matter | Anything that has mass and takes up space |
Element | Substances that are the building block of matter |
Compound | Matter made of two or more elements |
Atom | Smallest particle |
Electron | Negatively charged particle, found outside nucleus of atom |
Nucleus | Center of an atom |
Proton | Positively charged particle, in nucleus of atom |
Neutron | Neutral charge, in nucleus of atom |
Energy Level | The amount of evergy carried by an electron in a atom |
Isotope | Atoms of the some element with different numbers of neutrons in the nucleus of atom |
Mass Number | The sum of protons and neutrons in the nucleus of a atom |
Atomic Number | Number of protons in the nucleus of one atom of an element |
Metal | A class of elements characerized by physical properties |
Malleable | A term used to describe material that can be pounded into shapes |
Ductile | A term used to describe material that can be pulled out into a long wire |
Conductivity | The ability of an abject to transfer heat or electricity to another object |
Reactivity | The ease and speed with ehich an element combines, or reacts with other elements and compounds |
Corrosion | The gradual wearing away of a metal element due to a chemical reaction |
Alkali Metal | An element in Group 1 of the periodic table |
Alkali Earth Metal | An element in Group 2 of the periodic table |
Transition Metal | One of the elements in Group 3 through 12 of the periodic table |
Alloy | A mixture of two or more elements, one of which is metal |
Nonmetal | An element that lacks most of the properties of a metal |
Diatomic Molecule | A molecule consisting of two atoms |
Halogen | An element found in Group 17 of the periodic table |
Nobel Gas | An element in Group 18 of the periodic table |
Metaloid | An element that has come characteristics of both metals and nonmetals |
Semiconductor | A substance that can conduct electricity under some conditions |