A mixture where the individual substance remains distinct

A mixture where the composistion is constant throughout

A pure substance that cannot be separated into simpler substances by pyhsical or chemical means

Are made up of two or more elemets combined chemically

First subatomic particle, J.J. Thomson's plum pudding model of the atom states that the atom is a uniform, positively charged sphere containing electrons

Almost all of the atom's positive charge and almost all of its mass is contained in a dense region in the center of the atom which is the nucleus