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sciencetest8thndbeth
for test tom
| Question | Answer |
|---|---|
| the number of protons | atomic number |
| shows the number of electrons and arrangment | energy levels |
| for every positive proton in the nucleus,there is a negative electron on the outside | protons=electrons |
| a substance made only of one kind of atom, a substance that cant be broken down into simplier substances without losing its properties | element |
| subatomic particle | quark |
| when a particle consists of two or more of the same, most solids exist as atoms, most gases exist as this | molecules |
| two or more elements CHEMICALLY combined and has a definite formula | compound |
| elements and/or compounds combined together, not chemically proportions, can change | mixture |
| small number written half a line below the element symbol, tells how many atoms are needed in the formula | subscript |
| mid 1800s,atoms are solid spheres,all matter is made of atoms, atoms of same element are alike,atoms of different elements have different masses, elements can join to make compound | dalton |
| atoms are solid spheres with negative particles inside it, discovered electrons | thomson |
| discovered the center of the atoms contains most mass nucleus | Rutherford |
| planetary orbit, atoms have positively charged centers w negative electrons moving in circular orbits | Bohr |
| A/K/A electron cloud model with negative electrons buzzing randomly around nuclei | Rutherford-Bohr model |
| created the periodic table by charting elements know in his time | Mendeleev |
| put periodic table into nuclear form | Mosley |
| the force that holdes the atom together, bonding always involves electrons | chemical bonding |
| the electrons that form the bond, last energy level | valence electrons |
| when an atom gains or loses an electron in an attempt to become stable | ionic bonding |
| electron sharing, most common type of bonding, all moleculesare this bond, can bond 2 nonmetals together,can result in solids,liquids or gas | covalent bonding |
| covalently bonded atoms that gain and/or lose electrons **bond as a group** | polyatomic ions |
| an atom of an element w/the same number of protons but different number of neutrons | Isotope |
| occures in metals,many atoms share many electrons, **valence electrons create a sea of electrons that flow through the nucleus | metallic bonding |
| metals that can be hammered into sheets w/o breaking | malleable |
| can be drawn into wires | ductible |
| formed when ions create a repeating pattern that 3D crystals | crystal lattice |
| substance held together by covalent bonds but take on the look of an ionic solid | network solid |
| conduct electricity,are malleable, ductile, high density due to lattice structure | metals |
Created by:
dominator11
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