1. electrons elements with properties intermediate between those of metals and nonmetals
2. metals
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 vertical column on the periodic table
4. compound
two or more elements that have chemically combined
5. solution
positively charged, subatomic particles found in the nucleus of the atom
6. protons
negatively charged, subatomic particles
7. group
a homogeneous mixture whose particles are too small to reflect or scatter light
8. metalloids
a horizontal row on the periodic table