This wk: electronegativity and ionization energy.
Electronegativity- measures pull on electrons by nucleus
Ionization Energy- energy required to make an element react

This week, I learned about atoms and elements. 

I learned that in atoms, the proton (positively charged) and neutrons (no charge) compose the atom's nucleus, while electrons (negatively charged) float outside.

I learned that elements have certain numbers of each which determines what they are.