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strand a vocab
atoms
34
Science
8th Grade
12/09/2008

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Term
solid
Definition
the state of matter in which the volume and shape are fixed.
Term
liquid
Definition
the state of matter that has a definite volume but not a definite shape.
Term
gas
Definition
a form of matter that doesn't have a definite volume or shape
Term
pressure
Definition
a measure of the amount of force per unit area of a surface.
Term
plasma
Definition
the state of matter that is a blend of electrons and positively charged ions.
Term
atom
Definition
is the smallest particle into which an element can be divided and still be the same substance.
Term
electron
Definition
A subatomic particle that has a negative charge.
Term
nucleus
Definition
The central region of an atom that is extremly dense.And made up of protons and neutrons.
Term
electron cloud
Definition
regions inside the atom where electrons are likely to be found.
Term
protons
Definition
Positively charged subatomic particles in the nucleus.
Term
atomic mass unit
Definition
The SI unit used to express the masses of particles in atoms.
Term
neutrons
Definition
Are the subatomic particles of the nucleus that have no electric charge.
Term
neutral
Definition
Lacking a net charge.
Term
atomic number
Definition
The number of protons in the nucleus of an atom.
Term
isotopes
Definition
Atoms that have the same number of protons but have different numbers of neutrons.
Term
mass number
Definition
The sum of the protons and neutrons in an atom.
Term
atomic mass
Definition
the weighted average of the masses of all the naturaly occurring isotopes of an element.
Term
periodic
Definition
hapening at reular intervals.
Term
periodic law
Definition
states that the repeating chemical and physical properties of elements change periodically with the elements atomic numbers.
Term
period
Definition
a horizontal row of elements in the periodic table.
Term
group
Definition
each vertical column of elements on the periodic table.
Term
alkali metals
Definition
elements in group one of the periodic table.
Term
alkaline-earth metals
Definition
the elements of group two of the periodic table.
Term
halogen
Definition
one of the elements of group 17 of the periodic table.
Term
noble gas
Definition
the elements of group 18 of the periodic table.
Term
chemical bonding
Definition
the joining of atoms to form new substances.
Term
chemical bond
Definition
an interaction that holds two atoms together.
Term
valence eletron
Definition
an electron in the outer most energy level of an atom.
Term
ionic bond
Definition
forms when electrons are transferred fron one atom to another.
Term
ions
Definition
charged particals that formed when atoms gain or lose electrons.
Term
crystal lattice
Definition
when ions bond they form a repeating 3D pattern in which a crystal is formed.
Term
covalent bond
Definition
forms when atoms share one or more pairs of electrons.
Term
molecule
Definition
consists of two or more atoms that are joined in a definite ratio.
Term
metallic bond
Definition
a bond formed by the atraction between positively charged metal ions and the electrons in the metal.
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