Why are heavier elements much larger than lighter elements?

Which element has the lightest atoms?

An atoms consists mostly of

Why are metals good conductors of both heat and electricity?

The rate of energy transfer is 

What are the principal charges carried in electric wires?

What is most commonly the net charge of an atom.

Oxidation cannot occur without ________.

All waves have in common a

The persistence of sound due to multiple reflections.