| A | B |
|---|
| Atom | Smaller particle of an element which possesses the characteristics of that element. |
| Electron | Sub atomic particle found outside the nucleus and having a negative charge. |
| Proton | Sub Atomic particle found inside the nucleus and having a positive charge. |
| Neutron | Sub Atomic particle found inside the nucleus and having a neutral charge. |
| Nucleus | The central portion of an atom- usually consisting of protons and neutrons. |
| Mass | Amount of material (stuff) in an object. Proportional to weight but does not change with gravity. |
| Periodic | Table which arranges the elements according to their atomic number and their chemical characteristics. |
| Atomic | Number which represent an element and also equal to the number of protons. |
| Family | Name given to vertical columns of the Periodic Table. |
| Period | Horizontal row in the Periodic Table which indicates energy level. |
| Crystal | Object with regularly repeating arrangement of its atoms. Often with external plane faces. |
| Lattice | Pattern formed by imaginary lines connection the atoms of a crystal. |
| BCC | Crystal type with 8 particles forming a cube with a 9th inside the cube. Like potassium and sodium and iron. |
| FCC | Crystal type with 8 particles forming a cube and 6 more centered in each face. Like Al |
| HCP | Crystal type with 17 particles packed as closely as possible. Like Cobalt |
| Allotropes | Elements which occur in more than one form due to the way their atoms are packed. |
| Polymorphic | Having more than one form. |
| Rhombic | One of 7 simple crystal systems defined by three axes of unequal lengths oriented at 90 degree angles. |
| Monoclinic | One of 7 simple crystal systems defined by three axes of unequal lengths one pair of angles not 90 degrees. |
| Viscosity | Measurement of the opposition to flow in a fluid. |
| Molecule | Smallest particle of a covalent compound or nonmetallic element found in nature. |
| Metallic Bond | The force that holds solid metal together. Usually attributed to positive metal kernels being attracted to a sea of electrons surrounding them. |
| Covalent | Bonds which is the attraction between two atoms that are sharing electrons. |
| Van der Wall | Weak forces of attraction between molecules due to temporary electrical charges. |
| Kernal | Portion of a metal atom excluding the valence electrons. |
| Brittle | Physical property indicating the material will break when forced to undergo small deformations. |
