1.
the number of protons in an atom; a number unique to each
element
2. a substance made up of only one kind of atom
3. a positive or negative electrical quality
4. the center of the atom
5. the path in which an electron travels around the atom
approximately, the number of protons plus neutrons in an
6.
atom
7.
a union of two or more different elements in definite
proportion by mass
8. an atomic particle with a negative charge
9.
an atomic particle that has no charge and is found in the
nucleus
10. the combining power of an atom
11.
an atomic particle which is positively charged and found in
the nucleus
neutron
proton
valence
compound
element
charge
atomic mass
atomic number
orbital
nucleus
electron