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CMSScience8-Unit4
| Term | Definition |
|---|---|
| Atomic Symbol | A 1 or 2 letter internationally agreed code for a chemical element, usually derived from the name of the element, often in Latin |
| Bohr Model | A model to illustrate the location of the electrons within the electron cloud of an atom |
| Periodic Table of Elements | table showing the chemical elements arranged according to their atomic numbers |
| Net Charge | The sum of negative and positive charges |
| Noble Gases | Non-reactive gases in Group 18 of the Periodic Table. Outer electron shells are full. |
| AMU | Atomic Mass Units |
| Atom | The smallest unit of an element that has all of the properties of the element containing a nucleus within an electron cloud |
| Atomic Mass | The average mass of an element derived from all the isotopes. Consists mostly of protons & neutrons. |
| Atomic Number | The number of protons in the nucleus of one atom of the element |
| Electrical Charge | A form of charge, designated as negative, positive, or neutral. Subatomic particlesd have electrical charges |
| Electron e- | A negatively charged subatomic particle of the electron cloud; involved in the formation of chemical bonds |
| Electron Cloud | All of the area inside an atom surrounding the nucleus where electrons are found |
| Electron Shell | An orbit followed by electrons around an atom's nucleus |
| Element | A pure substance in its most simplest stage. |
| Group | The columns on a periodic table. Elements in same group (column) have same number valence electrons. |
| Subatomic Particle | Particles smaller then the atom (proton, neutron, electron) |
| Energy Level | Regions around the nucleus of an atom where electrons may be found |
| Neutron | A subatomic particle of the nucleus of an atom without charge and contributes to the mass of an atom |
| Nucleus | The tiny, very dense, positively charged region in the center of an atom; made up of protons and neutrons |
| Period | The rows in a periodic table classifing the elements by the number of atomic shells |
| Proton p+ | A positively charged subatomic particle of the nucleus of an atom and contributes to the mass of the atom |
| Reactivity | The likelyhood an atom combines with other atoms based on valence electrons |
| Valence Electron | Number of electrons in outer most energy level of an atom. Influences how element will react with other substances |
Created by:
randyoliver
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