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ch 2 section 1 DC
ch 2 section 1 DC
18
Biology
10th Grade
09/10/2012

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Term
matter
Definition
anything that occupies space and has mass.
Term
mass
Definition
the quantity of matter an object has.
Term
element
Definition
substances that cannot be broken down chemically into simpler kinds of matter.
Term
atom
Definition
the simplest particle of an element that retains all of the properties of that element.
Term
nucleus
Definition
the central region made up on protons and neutrons.
Term
proton
Definition
a subatomic particle that has a positive charge and that is located in the nucleus of an atom.
Term
neutron
Definition
a subatomic particle that has no charge and is located in the nucleus of an atom.
Term
atomic number
Definition
the number of protons in an atom. It appears directly above the chemical symbol in the periodic table.
Term
mass number
Definition
equal to the total number of protons and neutrons of the atom.
Term
electron
Definition
a subatomic particle that has a negative charge.
Term
orbital
Definition
a three-dimensional region around a nucleus that indicates the probable location of an electron.
Term
isotope
Definition
atoms of the same element that have different number of neutrons.
Term
compound
Definition
a substance made up of atoms of two or more different elements joined by chemical bonds.
Term
chemical bond
Definition
the attractive forces that hold atoms together.
Term
covalent bond
Definition
formed when atoms share one or more pairs of electrons.
Term
molecule
Definition
the simplest part of a substance that retains all of the properties of that substance and can exist in a free state.
Term
ion
Definition
an atom or molecule with an electrical charge.
Term
ionic bond
Definition
the attractive force between oppositely charged ions, which form when electrons are transferred from one atom to another.
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