1. DO NOW TUESDAY
Quietly sit down and begin work on your Physical and Chemical Properties and Changes quiz.
When finished, turn your quiz in at the side cart and pick up a half sheet of paper.
Write everything you know about atoms on this sheet.

2. Today’s PLAN
To differentiate between the subatomic particles of an atom: protons, neutrons, and electrons.
To explain the structure of the nucleus.
To discuss what the atomic mass number and atomic number represent concerning the atoms of an element.
Todays DO
We will complete foldables about the atom, atomic number, and atomic mass number as notes to put in our binders.
We will practice identifying the atomic number and atomic mass number. Any practice that is not completed during class will be HOMEWORK.

3. Atoms

4. Atoms Atoms are the basic building blocks of all matter.
EVERYTHING on Earth is made of atoms…even the air and your body.

5. Atoms Atoms are made of three particles: e- e- N + + Protons (+)
Neutrons (N)
Electrons (e-) + N N + e-
Electron
Proton
Neutron

6. Protons Protons Located in the nucleus N Have a positive charge
Have a mass of one N
Notice that protons and neutrons are same size, because have same mass.

7. Neutrons Neutrons Located in the nucleus N Have no charge
Have a mass of one –similar to the proton N N
Notice that protons and neutrons are same size, because have same mass.

8. Electrons Electrons have a negative charge e-
orbit the nucleus of the atom
are very small (have basically NO mass)
in a neutral atom, there are the same
number of protons and electrons

9. Atom Structure
Neutron -
Electron
Proton + + -

10. What force holds all the parts of an atom together?
It is the electromagnetic force of attraction between the positive protons in the nucleus and the negative electrons orbiting around the nucleus that holds the atom together.     

11. Lets take a look deep inside
Andy the Hydrogen Atom
Lets take a look deep inside

12. Lets take a look deep inside
Andy the Hydrogen Atom
Lets take a look deep inside

13. Lets take a look deep inside
Andy the Hydrogen Atom
Lets take a look deep inside

14. Lets take a look deep inside
Andy the Hydrogen Atom
Lets take a look deep inside

18. +

19. This is a Proton.
+ Charge
Mass of ONE
Identifies the atom +

20. This is a Proton.
+ Charge
Mass of ONE
Identifies the atom + N

21. This is a Proton.
+ Charge
Mass of ONE
Identifies the atom + N

22. e-
This is a Proton.
+ Charge
Mass of ONE
Identifies the atom + N
This is a Neutron
No Charge
Mass of One

23. This is an Electron.
- charge
No Mass e-
This is a Proton.
+ Charge
Mass of ONE
Identifies the atom + N
This is a Neutron.
No Charge
Mass of ONE

24. Elements contain one or more of the same type of atom!
Atomic Number
Elements contain one or more of the same type of atom!
All known elements can be found on the periodic table.
Elements can be identified by their atomic number.
The atomic number is the number of PROTONS in the
atoms of an element.
It can be used like a social security number for people.
It is used to IDENTIFY the element from the
Periodic Table.
Example:
An element with 6 protons has an atomic number of 6 and is
the element Carbon from the Periodic Table.

25. Now You Try Identify the element and tell how many protons it has:
1) Atomic number 7
Nitrogen: 7 protons
2) Atomic Number 20
Calcium: 20 protons
Identify the element and give its atomic number.
3) 15 protons
Phosphorus: Atomic number 15
4) 4 protons
Helium: Atomic Number 4
Give the atomic number and number of protons.
5) Argon
Atomic number 18; 18 protons
6) Sulfur
Atomic number 16; 16 protons

26. Atomic Mass Number
The atomic mass number includes the number of protons and neutrons, since they are the two largest particles in the atom.
Since they are both located in the nucleus, the mass of the atom is located in the nucleus.
Atomic Mass Number = protons + neutrons

27. Using the Periodic Table

28. Using the Periodic Table2

29. Using the Periodic Table2

30. Using the Periodic Table
Atomic Number-
identifies the element. (also the number of protons) 2

31. Using the Periodic Table
Atomic Number-identifies the element. (also the number of protons) 2 He

32. Using the Periodic Table
Atomic Number-identifies the element. (also the number of protons) 2 He

33. Using the Periodic Table
Atomic Number-identifies the element. (also the number of protons) 2
Element symbol- gives the name of the element. He

34. Using the Periodic Table
Atomic Number-identifies the element. (also the number of protons) 2
Element symbol- gives the name of the element. He 4

35. Using the Periodic Table
Atomic Number-identifies the element. (also the number of protons) 2
Element symbol- gives the name of the element. He 4

36. Using the Periodic Table
Atomic Number-identifies the element. (also the number of protons) 2
Element symbol- gives the name of the element. He 4
Atomic mass number-The number of protons + neutrons.

37. Using the Periodic Table
Atomic Number-identifies the element. (also the number of protons) 2
Element symbol- gives the name of the element. He 4
Atomic mass number-The number of protons + neutrons.

38. Now You Try
For the following pictures, give the name of the element, its atomic
number, number of protons, and atomic mass number.
Beryllium
Atomic number 4
4 protons
Atomic mass number 9
Sodium
Atomic number 11
11 protons
Atomic mass number 23
Oxygen
Atomic number 8
8 protons
Atomic Mass Number 16

39. Compounds contain more than one type of atom!
Example of organic compound (a compound with carbon and
hydrogen atoms):
Methane (natural gas) – CH4 (1 atom of carbon and
four atoms of hydrogen)
Example of inorganic compound (a compound without carbon
and hydrogen atoms):
Water – H2O (2 atoms of hydrogen and one atom of oxygen)

40. - +
IONS
An ion is an atom or group of atoms with a positive or negative charge!!
A particle with a neutral charge has the same number of
protons and electrons.
An ion does not have the same number of electrons and protons.
Examples of ions:
H A hydrogen atom that is missing one electron.
The atom has one more proton than electron,
and must have a positive charge.
CO32- - Carbonate has two more electrons than protons