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8th Grade Science
Texas Terms for 8.5 Matter & Energy, Structure of Atoms 8.5A & 8.5B
| Term | Definition |
|---|---|
| atom | the smallest unit; made up of subatomic particles called protons, neutrons, and electrons. |
| atomic mass | the mass of an atom, approximately equal to the number of protons + neutrons in an atom |
| atomic number | the number of protons in the nucleus of one atom of an element |
| Bohr model | a model that shows the negatively charged electrons of the atom traveling around the positively charged nucleus in discrete circular orbits |
| electron cloud | the area surrounding the nucleus of an atom, this is where electrons are found. |
| electron | A negatively charged particle found in the electron cloud, outside the nucleus |
| neutron | a neutrally charged subatomic particle found in the nucleus of an atom, contributes to the mass of an atom |
| proton | a positively charged subatomic particle found in the nucleus of an atoms, contributes to the mass of an atom |
| reactivity | the ability of a chemical substance to undergo a chemical reaction; significantly influenced by valence electrons of the reacting substance |
| valence electrons | any of the fundamental negatively charged particles in the outermost region of atoms that enters into the formation of chemical bonds |
| nucleus | the tiny, very dense, positively charged area in the center of an atom that is made of protons and neutrons |
| subatomic particles | particles that are smaller than the atom |
Created by:
marybuchholz
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