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chapter 2 and 3 bio
cells and proteins
16
Biology
Undergraduate 1
09/23/2015

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Term
when the number of protons= the number of electrons, the atom is _______
Definition
positive
Term
element
Definition
pure substance containing only one kind of atom
Term
elements can combine with other elements, therefore elements are not _______
Definition
stable
Term
What elements are organisms or found in organisms
Definition
H,C,N,O,P,S
Term
atomic weight
Definition
number of protons + the number of neutrons
Term
atom
Definition
the smallest part of an element
Term
element
Definition
a basic chemical substance on the periodic table of elements, they have only one type of atom
Term
molecule
Definition
2 or more atoms chemically joined together
Term
compound
Definition
a molecule made up of two or more elements bonded together in a fixed ratio
Term
isotopes
Definition
forms of an element with different numbers of neutrons, and thus different mass numbers
Term
________ atoms have unpaired electrons in their outermost shell
Definition
Reactive
Term
_________ does not follow the octet rule
Definition
hydrogen
Term
how many electrons does hydrogen have on the outside?
Definition
one
Term
order the bonds from strongest to weakest
Definition
covalent
ionic
hydrogen
hydrophobic
van der waals
Term
bond energy
Definition
the amount of energy needed to separate two bonded or interacting atoms under physiological conditions
Term
ions
Definition
electrically charged particles, when atoms gain electrons
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