Periodic Table
Atomic Number represents
What are protons and electrons
Definition of a valance electron
What is the number of electrons on the last energy level
An element that has one valance electron and one energy level
What is hydrogen
An element that is a halogen that has 7 valance electrons
What is Fluorine
The location of valance electrons
What is the last energy level
The number of energy levels that nitrogen has
What is two
What is reactivity