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