What can you conclude about the classification of silicon? A)
Silicon is a noble gas and has a full valence electron shell, is chemically non-reactive, colorless, odorless, and is a gas at room temperature.

B)
Silicon is a metal and is shiny, malleable, ductile, conducts heat and electricity, forms basic oxides, and forms cations in aqueous solution.

C)
Silicon is a nonmetal and is dull, brittle, poor conductor of heat and electricity, forms acidic oxides, and forms anions in aqueous solution.

D)
Silicon is a metalloid and has properties of both metals and nonmetals - it appears lustrous, but is brittle and a poor conductor of heat and electricity.

Consider the element sodium. It's atomic number is and equals .

A)
11; the number of protons

B)
12; the number of neutrons

C)
23; the sum of protons and neutrons

D)
23; the number of electrons