___________ molecules combine to form a new subtance

The atomic symbols and numbers used to abbreviate the name of a compound is called ____

Man who develop a simplified model of the atom is called ________

Man who developed a classification system for elements is called

_______________ a compound breaks apart into two or more simpler compounds

Substances that have only one kind of atom are called __________

Process that joins together different types of atoms is called ______

The study of matter is ___ what it is made of, what its usual characteristics are, how it reacts to other matter is called _____

The ________________ of an atom is based on the number of protons in the nucleus.

The _____________ classifies elements in categories showing which elements possess siimilar characteristics and react similarly with other elements.

An atom that has gained of lost electrons is called

The three mian parts of an atom are __________

The space that represents the average distance that electrons are from the nucleus is called a _______