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28 Cards in this Set

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  • Back
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Atoms
Smallest particles of an element that retain the chemical identity of the element
smallest
proton
positive (1+)
+
neutron
none (neutral)
neutral
electron
negative(1-)
-
atomic number
atom has no net electrical charge, the number of electrons it contains must equal the number of protons
electrons = protons
mass number
total number of protons plus neutrons in the atom
protons + neutrons
isotopes
same number of protons but different numbers of neutrons
atomic weight
average atomic mass of each element
group 1A
alkali metals
Li, Na, K, Rb, Cs, Fr
group 2A
alkaline earth metal
Be, Mg, Ca, Sr, Ba, Ra
group 6A
chalcogens
O, S, Se, Te, Po
group 7A
halogens
F, Cl, Br, I, At
group 8A
noble gases (or rare gases)
He, Ne, Ar, Kr, Xe, Rn
molecular compounds
compounds are composed of molecules and contain more than one type of atom
H20
molecular formulas
indicate the actual numbers and types of atoms in a molecule
H2O2
empirical formulas
chemical formulas that give only the relative number of atoms of each type (smallest possible whole-number ratio)
HO
ion
electrons are removed from or added to neutral atom
cation
ion with a positive charge
+
anion
ion with negatively charge
-
+, 2+, 3+
mean net charge resulting from the loss of one, two, & three electrons
-, 2-, 3-
net charges resulting from the gain of one, two, and three electrons
metal atoms
tend to lose electrons to form cations
nonmetal atoms
tend to gain electrons to form anions
anything that occupies space and has mass
(solid, liquid and gaseous state), less tangible
Matter
bones and teeth (have definite shape and volume
Solid
blood plasma have definite volume
Liquid
air we breath (no shape or volume)
Gas
defined as the capacity to do work, or to put matter into motion
Energy