1. Do First
Actions: In 5 minutes, I will collect your cell phones and you need place your bags and all your papers in the front. Do First: Write quiz today.

2. Agenda
Quiz
Interactive Simulation
Notes

3. Quiz YOU MAY WRITE ON THE QUIZ
Write the rich raider pledge at the top of your quiz: I ________ pledge that I have neither given nor received any assistance on this assignment.
When you are done with the quiz:
1. Turn in your quiz to the Mrs. Jain
2. Get your cell phone and backpack 3. Start the interactive simulation activity on your phone

4. ATOMIC STRUCTURE

5. Atomic Structure
An atom is the smallest particle of matter that retains the properties of the element
Realizing its size…
Atoms are composed of three subatomic particles

6. 1 AMU (slightly more massive than proton)
Atomic Structure
PARTICLE
MASS
CHARGE
ELECTRON
Virtually none
Negative
PROTON
1 AMU
Positive
NEUTRON
1 AMU (slightly more massive than proton)
neutral
In a neutral atom, the # of electrons must equal the # of protons
The identity of the atom is based on the # of protons

7. Atomic Structure
When atoms of the same element contain different #s of neutrons they are called isotopes
A neutral atom has an overall charge of zero
When an atom loses or gains electrons, an ion forms.
A cation forms when an atom loses electrons (+ve charge)
An anion forms when an atom gains electrons (-ve charge)

8. Valence electrons are the electrons in the outer most energy level.

9. Atomic Structure NUCLEUS Contains Protons (p+) and Neutrons (n)
Characterizes the mass of an atom
4th energy level (32 e-)
3rd energy level (18 e-)
2nd energy level (8 e-)
1st energy level (2 e-)
ELECTRON CLOUD
Region around nucleus where electrons (e-) move
Characterizes the volume of an atom

10. Atomic Number: # of protons in nucleus (also the # of electrons if neutral)6 C
Chemical Symbol: abbreviation for the name of an element (1st letter caps, 2nd letter lower case)
Average Atomic Mass: average mass of the mixture of isotopes
12.001

11. DYL What is the atomic number for Lead?
How many electrons does a neutral Lithium have?