What is a pure substance that cannot be broken down chemically into simpler substances?
element
How many atoms make up one kind of element?
one
What represents a name of an element usually written by a capital letter or a capital letter followed by a lower case letter?
chemical symbol
What is a pure substance made by chemically combining two or more elements?
compound
Where can you find a list of elements?
periodic table
What is the smallest particle of an element?
atom
What is the atomic number?
Number of protons in an atom
What has a negative charge in an atom?
electron
Apure substance that cannot be broken down chemically?
element
What is the total number of protons and neutrons in a specific atom?
mass
What is a model that organizes elements?
periodic table
