What is the definition of an element?

Where are metals and nonmetals located on the periodic table?

What are elements called that exhibit both metal and nonmetal characteristics?

What are the seven metalloid elements?

What is a compound and what is an example of one?

What are the $3$ subatomic particles? What is their mass and charge?

Describe the structure of an atom $($eg$.$ the nucleus and electron cloud$).$

Oxygen$-18$ and oxygen$-16$ are $2$ isotopes of oxygen.

What are the number of protons, neutrons, and electrons for both?

What is the electron configuration for nitrogen $(N)$ and the nitride anion $(N^3)?$

How many electrons can the $s,p,d$ and $f$ subshells hold?

How many orbitals does each on have?