vocabulary#4

element = a basic building block of matter ; a pure substance that cannot be broken down into anything simpler .

compound = a chemical combination of two or more elements into a single substance.

atom = the smallest unit of an element that still has the properties of the element .

proton= a particle with a positive charge in the nucleus of an atom .

neutron = an uncharged particle in the nucleus of an atom .
 electron = a particle with a negative charge moving around the nucleus of an atom .

nucleus = the dense center part of an atom .

molecule = a group of more than one atom joined together that acts like a single particle .

picture

element

compound

atom

proton

neutron

electron

nucleus

molecule