2.3 The Periodic Table and Atomic Theory

Pages 60-63http://www.chemicalelements.com/index.html

1

By Lester Green Smallwood Academy Gambo

1.20 Identify examples of common elements, and compare their characteristics and atomic structure.

2

CarbonAtomic Number 6Atomic Mass 12

OxygenAtomic Number 8Atomic Mass 16

FluorineAtomic Number 9Atomic Mass 19

NeonAtomic Number 10

Atomic Mass 20

1.21 Identify Energy Level

• First level2 electrons

• Second level8 electrons

• Third level 8 electrons

Energy Levels 2,8,8 3

1.21 continued…1st energy level ---2 electrons---

2nd energy level ---8 electrons---

3rd energy level ---8 electrons--- 4

Helium

Neon

Argon

1.20.2 Define valence energy level.

The outermost energy level of electrons around the nucleus of an atom

5

1.20.3 Define valence electrons.

The outermost electrons around the nucleus of an atom

Also known as Valence Number

Oxygen Valence Number 6CarbonValence Number 4

6

1.20.3 continued…

7

1.20.3 continued…

8

1.20.4 Draw Bohr-Rutherford diagrams for elements 1 to 18 (20)

Worksheet: Draw Bohr-Rutherford Models

9

1.20.5 Identify the maximum number of electrons which exist in the first three energy levels.

10

First energy Level

2 electronsSecond energy level

8 electronsThird energy level

8 electrons

1.21 Interpret patterns and trends, and explain relationships among variables.

11

1.21.1 Make comparisons of energy level diagrams for elements from the same family or group

12