The document provides an overview of basic chemistry concepts including: - Matter is anything that takes up space and has mass, and is made of elements which cannot be broken down further. The human body is mainly made of oxygen, carbon, hydrogen, and nitrogen along with trace elements. - Atoms are the smallest unit of matter and contain protons, neutrons, and electrons. Electrons orbit the nucleus of the atom. The periodic table shows the structure of atoms based on atomic number and mass number. - Chemical bonds such as ionic and covalent bonds form through the interaction of atoms and the sharing or transfer of electrons. Chemical reactions involve the breaking and forming of these bonds to create new substances.

1. Basic Chemistry

5. Control Minus Nitrogen

6. Goiter – minus Iodine

7. The Atom The smallest unit of matter that still retains the properties of an element.

13. Find the # of protons, neutrons, and electrons for each element.

17. Determine the # of protons, electrons, and neutrons for each. Then, draw the atom.

30. 2H 2 + O 2  2H 2 O Product Reactants