Matter - ANSWERSAnything that has mass and takes up space
Element - ANSWERSA substance that cannot be broken down into simpler substances
Compound - ANSWERSA substance consisting of two or more elements in a fixed ratio.
essential elements - ANSWERSA chemical element required for an organi...
Biology 1305 Chapter 2 Questions &
Answers
Matter - ANSWERSAnything that has mass and takes up space
Element - ANSWERSA substance that cannot be broken down into simpler substances
Compound - ANSWERSA substance consisting of two or more elements in a fixed ratio.
essential elements - ANSWERSA chemical element required for an organism to survive,
grow, and reproduce. About 20-25% of the 92 natural elements are required for life.
trace elements - ANSWERSessential elements that are required by an organism in only
minute quantities
Atom - ANSWERSthe smallest unit of matter that retains the properties of an element
Neutrons - ANSWERSa subatomic particle with no charge and is found in the nucleus of
an atom
Protons - ANSWERSA subatomic particle that has a positive charge and that is found in
the nucleus of an atom. Determines the elements identity.
Electrons - ANSWERSa subatomic particle with a negative charge
atomic nucleus - ANSWERSAn atom's dense central core, containing protons and
neutrons.
daltons - ANSWERSThe unit neutron mass and proton mass are measured in since
they're identical.
atomic number - ANSWERSthe number of protons in the nucleus of an atom
mass number - ANSWERSthe sum of the number of neutrons and protons in an atomic
nucleus
atomic mass - ANSWERSthe atom's total mass, can be approximated by the mass
number
Isotopes - ANSWERStwo atoms of an element that differ in number of neutrons
Radioactive isotopes - ANSWERSIsotopes that decay spontaneously, giving off
particles and energy
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