Glossary of Earth Science Cpt. 8 (Holt, Rinehart)

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anything that takes up space
Chemical properties
those characteristics that describe how a substance interacts with other substances
Physical properties
characteristics that can be observed without changing the composition of the substance
the smallest unit of an element that has all the properties of the element
subatomic particles found in the nucleus of the atom with no charge
subatomic particles that are found in the nucleus of the atom with a positive charge
subatomic particles found in a region of space around the nucleus with a negative charge
electron cloud
the region of space around the outside of the nucleus where electrons are found
atomic number
a number assigned to elements by scientists that is the sum or total of the electrons plus the protons of that atom
periodic table
a system for classifying elements
mass number
a number that represents the total or sum of the the protons and neutrons in an atom
particles are packed tightly together
has a definite shape and volume
particles have spaces between them
has a definite volume, but takes the shape of the container it is in
wide spaces between particles
no definite shape or volume
when atoms of two or more elements are chemically joined
smallest complete unit of a compound
diatomic molecule
made up of two atoms
energy levels
found within the electron cloud these are levels that hold the electrons
chemical bonds
forces holding atoms together
ionic compound
a compound formed through the transfer of electrons
covalent bond
a bond formed by the sharing of electrons between atoms
chemical formula
shows what elements and the number of atoms of elements found in a compound
contains two or more substances that are NOT chemically combined
a mixture in which one substance is equally dispersed (spread) throughout another substance.
an unhealthy mixtures of dust and fumes from industrial smoke stacks and car exhausts
a solution of two or more metals
an atom or a group of atoms that carry an electrical charge
ionic bond
a bond made by the transfer of electrons from one atom to another
atoms of the same element that have different number of neutrons
chemical bond
force that holds atoms that combine to make a compound
covalent compound
a compound formed by the sharing of electrons

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