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sciencetest8thndbeth

for test tom

QuestionAnswer
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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