What is an element?

What is an atom?  Where are the protons, neutrons and electrons located?

How do I determine the number of protons, neutrons & electrons for an element on the periodic table?

What is the charge of a proton, neutron and electron?

What is atomic number?  What is atomic mass?

How do I find the number of neutrons in an atom?

What is an isotope?

How do I determine the number of protons, neutrons & electrons for an isotope?

What is valence?  How can you know how many valence electrons an element has?

How do I draw a Bohr diagram for elements 1-20?

What is a chemical bond?  What kind of bonds to molecules have?

What’s the difference between an element, a compound and a mixture?

What is a metal, non-metal and metalloid?

What are thermal conductors, electrical conductors and insulators?