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Name: _______________________
Chem. Notes
Date: __________ /HW#: ____
Mr. Jensen/Period: _____
Let’s talk chemistry!
1. The atom
 Basic unit of _________________________
 Made up of __________________, ___________________ and _______________
 The whole atom is _____________________ charged (no charge)
Fill-in the following:
Helium Atom: Atomic Number 2
Number of protons: _____
Number of Electrons: _____
Number of Neutrons: 2
Now draw the atom in the box below and label the protons, neutrons and electrons.
2. Structure of an atom
The nucleus of an atom:
 Protons are _________________________ charged
 Neutrons have ______ charge
Electrons:
 in constant _________________ around nucleus
 _______________________ charged
Atoms have an equal number of _________________ and _________________.
3. Elements
 _________________ substance
 Made of ___________ type of atom
 Represented by _____, _____ or _____ letters
4. History of the Periodic Table
 ______________________ (watch your spelling!) designed the first periodic table
 He arranged the elements by ________________________ atomic mass
 He left ________________ spaces according to similarities in columns of elements
 Mendeleev’s __________________ spaces (or predictions) were elements that he claimed
were not __________________________ yet.
 As it turns out, he was right!!
 Scientists later ______________________ the missing elements with the properties that
Mendeleev predicted!
And even more history!
 Moseley discovered the ____________________ number
 He organized the periodic table by increasing _________________ number
 This allowed for elements with similar _______________________ to fall into place
 An gave way to the _____________________ periodic table
5. Molecules
 Smallest unit (part) of a compound
In the box, draw and label the elements in a water molecule (H2O)
6. Compounds
 a substance that contains ______________ or more different elements
 organic compounds must contain ________________________
 Acetic acid (vinegar) is an example
7. Molecular formula
 Shows how many _________________ of each element a molecule contains
 Does not tell you about a molecule’s __________________________
Examples of molecular formulas – fill in the number of each atom for each of the following
formulas.
H2O
Hydrogen atoms __________
Oxygen atoms _________
NH3
Nitrogen __________
Hydrogen __________
C6H12O6
Carbon ___________
Hydrogen __________
Oxygen ___________
8. Structural formula
 Shows how atoms are _______________________ in a molecule
 2-dimensional representation of a molecule’s ______________________
Label each of the following molecules with their name and molecular formula
Name: ________________
Name: ________________
Name: ________________
Formula: ______________
Formula: _____________
Formula: ______________
9. 3-D Models
 Shows how the __________________ are _________________________in a molecule
 Is able to be _______________ or _______________________, allowing you to view
the molecule from ___________________________
_________________________.