Answer:
1. electrons
F. negatively charged, subatomic particles
2. metals
C. elements that are malleable, polish to a luster, conduct heat and electricity well and tend to lose electrons in a chemical reaction
3. period
A. a horizontal row on the periodic table
4. compound
E. two or more elements that have chemically combined
5. solution
B. a homogeneous mixture whose particles are too small to reflect or scatter light
6. protons
H. positively charged, subatomic particles found in the nucleus of the atom
7. group
G. a vertical column on the periodic table
8. metalloids
D. elements with properties intermediate between those of metals and nonmetals