1. Element Guide 2

2. Atomic Number
= protons or electrons
Determines the element 2

3. Learning Check
State the number of protons for atoms of each of the following: 1. Nitrogen A) 5 protons B) 7 protons C) 14 protons 2. Sulfur A) 32 protons B) 16 protons C) 6 protons 3. Barium A) 137 protons B) 81 protons C) 56 protons

4. Element Guide 2 He Atomic Number: Proton or electron
Symbol: explains name of the element. He

5. Symbol
One or two letters chosen to represent an element. The first letter is the only one capitalized
Ex: H- Hydrogen
Ex: Cu- Copper
Ex: Au- Gold 2 He

6. Element Guide 2 He 4 Atomic Number: Proton or electron
Symbol: Name of element 4

7. Everything in the nucleus of an atom.
Protons + Neutrons (nucleus)
Mass number - atomic number = neutrons
Example: Mass number
Mass number 14.
Atomic number is 7
Neutrons= (14-7) 7
Atomic Mass 2 He 4
Everything in the nucleus of an atom.
Review

8. Learning Check
Using the periodic table, specify the atomic mass of each element (round): 1. calcium __________ 2. aluminum __________ 3. lead __________ 4. barium __________ 5. iron __________
40 amu
27 amu
207 amu
137 amu
56 amu

9. Element Guide 2 He 4 Atomic Number: Proton or electron
Symbol: name of element He 4
Atomic Mass: protons + neutrons

10. Elements
element
atom
nucleus
protons
neutrons
electrons

11. P:1
N:0
E:1
P:2
N:2
E:2
P:3 N4
E:3
P:4
N:5
E:4
P:5
N:6
E:5
P:6
N:6
E:6
P:7
N:7
E:7
P:8
N:8
E:8
P:9
N:9
E:9
P:10
N:10
E:10
P:11
N:12
E:11
P:12
N:12
E:12
P:13
N:14
E:13
P:14
N:14
E:14
P:15
N:16
E:15
P:16
N:16
E:16
P:17
N:18
E:17
P:18
N:22
E:18

12. First orbital has a max of 2 electrons
Valence Electrons
How Many Valence Electrons
Outer electron on last orbital
Determines the reactivity of an element
Determines which elements it bonds with
Remember 2,8,8 (or 18).
First orbital has a max of 2 electrons
Second orbital has a max of 8 electrons
Third orbital has up to 8 or 18 electrons 2 8
8 or 18

13. VE:1
E:2
VE:1
VE:7
VE:2
VE:3
VE:4
VE:5
VE:6
VE:8
VE:1
VE:2
VE:3
VE:4
VE:5
VE:6
VE:7
VE:8

14. Atomic Structure Models
Objective
Create a model of an atom of specific elements
Materials
Paper plates
Glue
3 colors of Colored cereal
Task
Choose a different color for protons, neutrons and electrons
Figure out how many protons your element has
Figure out how many neutrons your element has
Figure out how many electrons your element has
Using a marker or a pen, draw a circle for the nucleus and one, two or three circles to be the orbitals
Glue Trix onto plate to show the correct number of protons neutrons and electrons
Do this for one element in period 2 and one in period 3

15. VE:1 VE:7 VE:2 VE:3 VE:4 VE:5 VE:6 VE:8 VE:1 VE:2 VE:3 VE:4 VE:8 VE:5
Lewis Dot Structure
Represents Valance Electrons
VE:1
VE:7
VE:2
VE:3
VE:4
VE:5
VE:6
VE:8
VE:1
VE:2
VE:3
VE:4
VE:8
VE:5
VE:6
VE:7
VE:8