1. Atomic Structure

2. What is an atom?
Atom: the smallest unit of matter that retains the identity of the substance

3. Atomic Structure Atoms are composed of 2 regions: Nucleus Electron
Cloud

4. The Nucleus
Nucleus: the center of the atom that contains the mass of the atom
The Nucleus contains Protons and Neutrons.
Protons: positive charge
Neutrons: neutral charge

5. The Electron Cloud
Electron cloud: region that surrounds the nucleus that contains the space/volume in the atom
Contains the Electrons
Electron: negative charge
Has relatively no mass

6. An atom must be balanced!
In an atom:
The # of protons = the # of electrons
The neutrons have no charge; therefore they do not have to equal the number of protons or electrons

7. How can we find the number of protons, neutrons, and electrons?
Atomic number: this number indicates the number of protons in an atom
Atomic Mass: the number of protons and neutrons in the atom.

8. This information is found on the Periodic Table1 H
1.008
Atomic Number
Symbol
Atomic Mass
Hydrogen
Element’s Name

9. Calculating the neutrons
How can we find the Neutrons?
# of neutrons = mass # - atomic #

10. What about the electrons?
The electrons are equal to the number of protons
Atomic # = protons = electrons

11. Determining the number of protons, neutrons and electrons
Li has an atomic number of 3 and a mass number of 7
Protons = ____ (atomic #)
Neutrons= ____ (mass # - atomic #)
Electrons = ____ (electrons = protons)
Ne has an atomic number of 10 and a mass number of 20
P = ____ N = ____ E = ____

12. How are the particles arranged in an atom?
The Bohr Model of the atom:
Nucleus - protons and neutrons
3rd ring holds up to 18 e-
1st ring holds up to 2 e-
4th ring holds up to 32 e-
2nd ring holds up to 8 e-

13. What does Carbon (C) look like?
Atomic # = Mass # = 12
p+ = no = e- = 6
6 p and 6 n live in the nucleus

14. What does Fluorine (F) look like?
Atomic # = Mass # = 19
p+ = no = e- = 9
9 p and 10 n live in the nucleus

15. Atomic Structure and Bohr Model Practice
On the front…
Boron (B)
Nitrogen (N)
Calcium (Ca)
Nickel (Ni)
On the back…
Sodium (Na)
Beryllium (Be)
Neon (Ne)
Sulfur (S)

16. Bohr Model Trading Cards
Write your name on the bottom right corner of paper.
Choose 2 elements (with an atomic # less than 92) from the Periodic Table.
Write the info (atomic #, symbol, name and atomic mass) for those elements on the 2 papers provided.

17. Bohr Model Trading Cards
Trade with 2 different people.
Write your name in the bottom right corner and then draw the Bohr Model for that element on the back.
Use a marker and trace over your Bohr Model. Make it look pretty 
Tape it up anywhere on the wall when you are finished.