1. November 29, 2016
Objective:
To calculate the numbers of protons, neutrons, and electrons in an atom using the periodic table
Describe the structure of at atom
Journal: We are starting a new unit on basic chemistry. What do you think we are going to learn about?

2. Chemistry – Atoms

3. Atoms
The smallest particle into which an element can be divided and still be the same substance
All living things are made of atoms

4. Subatomic Particles Protons: Neutrons: Electrons: Positively charged
Located in the nucleus
Neutrons:
No charge (neutral)
Electrons:
Negatively charged
Located in the electron cloud (orbitals)

5. Electron Configuration
The location within the electron cloud where the electrons are most likely to be found
1st shell holds maximum of 2 electrons
All other shells hold a maximum of 8 electrons

6. Atomic Structure

7. Periodic Table

8. Elements on the Periodic Table

9. Atomic Number
Biggest size number in each box when looking at the periodic table
Atomic Number = Number of Protons = Number of Electrons

10. Atomic Weight The total number of protons and neutrons added together
Small number underneath the symbol when looking at the periodic table

11. How to find numbers of… Number of protons = Atomic Number
Number of electrons = Atomic Number
Number of neutrons =
Atomic Weight – Atomic Number
*Round atomic weight to the nearest whole number before subtracting

12. Valance Electrons The number of electrons in the outer shell.
Used for bonding

13. Octet Rule
When bonding, each atom wants to have a full outer shell (8 valance electrons)
***Exception is Hydrogen, which can only hold two electrons in its outer shell