KWL

Chemistry: the study of matter and dealing with the composition of substances and their properties and reactions.

What I know:

1. You add the electrons to find the element

2. There can only be 2,8 and 16 in the first, second and third layers

3. Protons are positive neutrons are zero and electrons are negative

4. Protons and electrons ALWAYS need to be even

What I want to know:

1. Why do atoms undergo physical changes?

2. Who invented the periodic table?

3. How do atoms multiply?

4. Can you see atoms with a microscope?