1. DO NOW:
What is the distance it takes Daniel to go to the store and go back home? What is his displacement?
50 meters one way

2. Masses of Atoms
Essential Question: What is the difference between the atomic number and the atomic mass?

3. Is the Atom the Smallest Particle?
Smaller particles of matter called quarks exist but scientist still consider ATOMS the basic building blocks of matter.
Quark: smaller particles that make up protons and neutrons- six quarks are known to exist.

4. What is Atomic Mass?
The mass of the atomic particle – also called Mass Number.

5. What is the Atomic Number?
The number of protons in an atom.
Number of protons also identifies the Element.

6. How do you find the # of Neutrons for each element?
# of Neutrons= Mass Number – Atomic Number
EX:
# of neutrons=
6= 12-6

7. DO Now:
Please Solve:
3000mg=_________g???

9. Find the Neutrons and Protons of:

10. How do you find the number of Electrons?
The number of protons is equal to the number of electrons. We are Assuming that the element is neutral. This means that the element does not have a charge.

11. How does this look when its all together?
P+=2 (Atomic Number)
N= 4-2=2
e-= 2 (# of protons)

12. How does this look when its all together?
P+=2 (Atomic Number)
N= 4-2=2
e-= 2 (# of protons)

13. Find the p+,n, and e- of each element:

14. What is a Bohr Model?
The Bohr model of the atom describes the arrangement of electrons around the nucleus of an atom in terms of energy levels or shells around the nucleus.
It’s a Picture!

15. How to draw a Bohr Model? Draw the ______
Look on the periodic table to determine the number of e-
Draw the number of electrons on the appropriate shell.
First energy level only hold 2 e-
Second energy level only hold 8 e-
Third energy level holds 18 e-

16. Essential Question: What is the difference between the atomic number and the atomic mass?