1. 3.1 Matter And Substances I. Atom
A. Def- the __________ _______of matter that cannot be broken down by chemical means.
B. Atomic structure
1. Protons = _______________
2. Neutrons = ______________
3. Electrons = ______________

2. 1. Made up of all the same __________ a. ex- _________________
4. Protons & Neutrons have same ______ and are found in the ____________
5. Electrons are _________ the mass of protons & neutrons. Found in electron __________ around the nucleus.
C. ______________
1. Made up of all the same __________
a. ex- _________________
2. __________ have extra __________
a. makes atom ________, no change in overall __________.

3. II. Chemical ___________
A. ___________ electrons
1. Electrons in the __________ energy level.
2. This level wants to fill to _____ electrons.
B. ______________
1. Made up of ____ or more elements

4. C. ___________ Bonding
1. The _________ of electrons
2. A ___________is a group of atoms held together by a _________ bond
3. Not all substances that have covalent bonds are___________.
a. ____ covalent bond, not a compound
b. _______ covalent bond, compound

5. D. __________ Bonding
1. ________ or _______electrons
2. ion – ____________ or __________ charged group of atoms.
3. ionic bond is the attractive force between ___________ charged ions.
4. ex- ____________ (NaCl)
a. ________(Na+) - silver, soft metal that explodes in water b. __________(Cl-) - green toxic gas

6. III. ___________
A. Molecules with partial charges on __________ ________ are polar.
B. _____________
1. ________ can dissolve polar molecules
a. ex.- _________, _________
2. ____________ molecules do not dissolve in water. They instead ___________ together.
a. ex.-______, __________, ________

7. C. Hydrogen Bonds
1. Stronger than attractions between other molecules but not as strong as a covalent bond.
a. ex.- 2 strands of DNA are held together by hydrogen bonds between bases.