Name _______________________ Period _____ Date _________________
the Periodic Table Review Sheet
element -
a substance that can not be broken down into other substances by
chemical or physical means
the smallest particles of an element
atom -
atomic number -
the number of protons in the nucleus of an atom
How is this shown on a periodic table?
the number at the top of the
element box
The number
of__protons_
and the number
of___electrons___
are equal in an
atom making the atom neutral.
atomic mass -
the average mass of one atom of an element
How is this shown on a periodic table?
the number at the bottom of the
element box
valence electron -
the electrons that are farthest away from the nucleus of an
atom and can form chemical bonds
How is this shown on a periodic table?
the group number
st
What is the maximum number of electrons in the 1 energy level?
2
nd
rd
the 2 ?
8
the 3 ?
8
How are the number of energy levels shown on a periodic table?
the period number
chemical bond -
force that holds atoms together
Why do substances react (chemically bond)?
To have atoms with an outermost energy level filled with electrons. This is
done by gaining, losing or sharing electrons.