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30 Cards in this Set

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a unique substance that cannot be decomposed or broken down into simpler substances by ordinary chemical methods
element
4 elements that make up 95% of our bodies
oxygen, carbon, hydrogen, and nitrogen
oxygen
o
carbon
c
hydrogen
h
nitrogen
n
calcium
ca
phosphorus
p
potassium
k
sulfur
s
sodium
na
chlorine
cl
magnesium
mg
iodine
i
building block of an element... the smallest particle that still retains its special properties
atom
positive charge
proton
netural charge
neutron
negative charge
electron
inside the nucleus
protons and neutrons
outside the nucleus
electrons
equal to the number of protons its atom contains
atomic number
when two or more elements combine chemically, ________ is formed
molecules
formed when electrons are completely transferred from one atom to another
ionic bond
formed when atoms are share electrons
covalent bond
acids that ionize completely and liberate all of their protons are called
strong acids
acids that ionize incompletely are called
weak acids
negative ions
anions
positive ions
cations
pH lower than 7
acids
pH higher than 7
bases