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Bio Vocab
4.1-4.2 Key Vocabulary
12
Biology
10th Grade
01/05/2012

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Term
Matter
Definition
• Anything that takes up space
and has mass
Term
Element
Definition
• A pure substance that can not
be broken down into other
substances by chemical
means
Term
Trace Element
Definition
• Any element that makes up
less than 0.01% of the mass
of a living organism but is
critical to the health of the
organism
Term
Compound
Definition
• A substance containing two or
more different elements that
are chemically combined
together
Term
Atom
Definition
• The simplest particle of an
element that retains all the
properties of that element
Term
Proton
Definition
• A subatomic particle with a single
unit of positive electric charge (+).
– One of the two types of
particles found in the nucleus of
an atom
Term
Electron
Definition
• A subatomic particle with a single
unit of negative electric charge (-).
– These particles found outside
the nucleus of an atom.
– These particles are involved in
chemical bonding
Term
Neutron
Definition
• A subatomic particle that has no
charge (is electrically neutral).
– One of the two types of
particles found in the nucleus of
an atom
Term
Nucleus
Definition
• The central core of an atom that
contains protons and neutrons
Term
Atomic Number
Definition
• The number of protons in an
atom's nucleus.
– This number is unique for each elemen
Term
Isotope
Definition
• One of several forms of an
element, each containing the
same number of protons in their
atoms but a different number of
neutrons
Term
Radioactive Isotope(Radio-Isotope)
Definition
• An isotope in which the nucleus
decays (breaks down) over time,
giving off radiation in the form of
matter and energy.
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