There is huge debate as to whether light is a particle or a wave (hence waveicle). There are different experiments which 'prove' that it can be one or the other. To us laymen it ... http://www.theanswerbank.co.uk/How-it-Works/Questi...
if is a substance is made up of all the same atoms it is an element if it is two or more atoms that make up the substance then it is a compound molecule is used to describe a singl... http://uk.answers.yahoo.com/question/index?qid=200...
A pure substance made of only one type of atom is an element. An element, or elementary substance. An element. http://wiki.answers.com/Q/What_is_a_pure_substance...
