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8SC atoms
atoms & periodic tab
| Term | Definition |
|---|---|
| Protons | positively charged particles in the nucleus |
| neutrons | particles of the nucleus that have no charge |
| atomic number | number of protons in the nucleus of an atom |
| isotopes | atoms that have the same number of protons but have a different number of neutrons |
| mass number | the sum of the protons and neutrons in an atom |
| atomic mass unit | the SI unit used to express the masses of particles in atoms |
| atomic mass | the weighted average of the masses of all naturally occurring isotopes of an element |
| chemical bonding | the joining of atoms to form new substances |
| chemical bond | a force of attraction that holds two atoms together |
| valence electrons | electrons in the outermost energy level of an atom |
| molecule | a neutral group of atoms held together by a force of attraction through the sharing of electrons |
| chemical reaction | process by which one or more substances undergo change to produce one or more different substances |
| electrons | megatively charged particles found in all atoms |
| model | representation of an object or system |
| nucleus | tiny, extremely dense, positively charged region in the center of an atom |
| electrons couds | regions inside an atom where electrons are likely to be found |
| atom | smallest particle into which an element can be divided and still be the same substance |
Created by:
cynthia_ritter
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