| Question |
 |
|
| Answer |
|
|
| Atom |
smallest particle of an element that can be combined with other atoms for form a molecule |
| Element |
matter that cannot be changed into a simple form by any ordinary physical or chemical change |
| Electron |
a small negatively charged subatomic particle |
| Proton |
a small positively charged subatomic particle |
| Neutron |
a subatomic particle with the same mass as a proton but no electrical charge |
| Atomic Number |
number of protons an atom of an element contains |
| Isotopes |
atoms of the same element that have different number of neutrons |
| Atomic Mass Number |
the number of protons and neutrons in an atom |
| Synthetic Elements |
elements that are not found in nature at all but are created in laboratories |
| Compound |
a substance made of 2 or more elements |
| Ion |
a charged particle formed when an atom or a group of atoms gains or loses one or more electron |
| Cation |
A positively charged ion (the atom lost an electron) |
| Anion |
a negatively charged ion (that atom gained an electron) |
| Ionic Compounds |
formed when a cation joins with an anoin |
| Dalton's Model |
all matter is made up of tiny individual particles; envisioned atoms as a sphere; atoms of each element are exactly alike but have different masses |
| Thomson's Model |
atoms not solid spheres, contained subatomic particles (electrons- do NOT move) |
| Rutherford's Model |
discovered protons and nucleus, electrons and protons evenly scattered throughought an atom; used gold sheet test |
| Bohr's Model |
defined locations of electrons, electrons must follow specific orbital patters called energy levels- planetary model |
| Electron Cloud Model |
electrons move about in an energy level with an ever changing pattern (blades of a fan) |
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