1. Lesson Objective: Describing how an atom can be changed and what it changes into
Do Now :  How do you think an atom can be changed?(SILENTLY AND INDEPENDENTLY, 5 POINTS)

2. Changes to an Atom

3. Adding Atoms

4. Molecules
An atom that is _____________________ with one or more other atoms.
chemically bonded H2 + =

5. Atoms want to be complete.Cl Na
A sodium atom needs _______ electrons to complete its last shell.
A chlorine atom needs _______ electron to complete its last shell. 7 1

6. MESSING WITH THE ELECTRONS

7. MESSING WITH THE ELECTRONS
SO LETS ADD AN ELECTRON AND SEE WHAT HAPPENS.
CHLORINE NEEDS ONE MORE VALENCE ELECTRON!
CHLORINE ATOM

8. More electrons then protons.
Ions
An atom that carries a positive or negative electric charge as a result of having _____________________one or more electrons.
lost or gained =
ANION
(NEGATIVE ION) +
1 ELECTRON
17 Protons
18 Electrons
More electrons then protons.
CHLORINE ATOM

9. WHAT IF I TAKE AWAY AN ELECTRON
SODIUM ONLY HAS ONE VALENCE ELECTRON AND DOESN’T NEED IT.
SO LETS GET RID OF THAT ELECTRON AND SEE WHAT HAPPENS.
SODIUM ATOM

10. More protons then electrons.
Ions
An atom that carries a positive or negative electric charge as a result of having lost or gained one or more electrons. _ =
CATION
(POSITIVE ION)
1 ELECTRON
10 Electrons
11 Protons
SODIUM ATOM
More protons then electrons.

11. Review Atom Cation Anion (+) (-) Loss of electron(s)
Gain of electron(s)
Cation
(+)
Anion
(-)

12. MESSING WITH THE NEUTRONS

13. Adding an Neutron Lets take a carbon atom. Carbon has 6 Electrons
6 Protons
6 Neutrons
This would be classified as Carbon-12
We’re going to focus on the amount of neutrons.

14. Isotope Proton- 6 Proton- 6 Electron- 6 Electron- 6 Neutron- 6
Versions of an element that have the same number of protons, but different numbers of neutrons.
Carbon
C-13
Carbon
C-12
Proton- 6
Electron- 6
Neutron- 6
Proton- 6
Electron- 6
Neutron- 7
Gains 1 neutron

15. Some elements have more then one isotope
Carbon
C-14
Carbon
Proton- 6
Electron- 6
Neutron- 6
Proton- 6
Electron- 6
Neutron- 8
Gains 2 neutron

16. But what about changing those protons……
What do we know so far…..
Changing the amount of electrons causes the atom to become an _________________
Changing the amount of Neutrons causes the atom to become An ___________________
Ion
Isotope
But what about changing those protons……

17. A Hydrogen Atom has only 1 Proton.
Elements
Every element has an atomic number. This atomic number says the amount of protons that atom has. 1 H
A Hydrogen Atom has only 1 Proton.
Hydrogen
1.008
Lets give Hydrogen another Proton and see what happens……

18. He H + Lets give Hydrogen another Proton and see what happens…… 1 2
NOW
BECOMES
HELEIUM
1 PROTON
Hydrogen
Helium
1.008
4.002
Changing the atomic number, changes the element.