- Anything that would take up a lot of spaced and which as a lot of mass too.

- All the matter is made with/up of atoms

- Atom is the smallest unit of a chemical element

- Each element is made out of only one kind of atom.

- There are 120 elements!

- Examples:

Hydrogen

Oxygen

Carbon

Iron

Gold

- Periodic table is a list of all of the chemical elements that exist in the universe that has only been discovered by humans do far


- Only categorizes and organize elements according to the properties of their atoms.

- Formed when only 2 or more atoms are joined together.


- These may be 2 of the same atom or 2 different atoms

- Firmed when there are 2 or more different atoms are joined together.



- Note: All compounds are also molecules, but not all molecules are compounds.

Subscripts can tell you how many atoms of each element for that molecule.

Coefficients can multiply the number of molecules that you are making.

Photosynthesis is a process when the plant would turn sun, water, carbon dioxide. Into a oxygen in which would also be glucose.

Cellular Respiration is when the cells in the plants and animals break down the glucose and turn into a energy.l