Periodic Table of Elements: TEKS 8.5C

To the teacher:• This CPO Science PowerPoint presentation is designed to guide you

through the process of presenting the lesson to your students. The presentation uses a 5-E teaching model: Engage, Explore, Explain, Elaborate, and Evaluate.

• The PowerPoint Slide notes indicate where you may want to bring in various lesson elements such as quizzes, readings, investigations, animations, and practice materials. Additional science background information is provided in the slide notes where appropriate. You can view these notes by selecting “View,” then “Normal.” You will see the notes pane at the bottom of the PowerPoint workspace. Additionally, the slide notes are available as a separate document, accessible from the lesson home page.

• The slides that follow are intended for classroom use.

Periodic Table of Elements: TEKS 8.5C

What’s the difference betweenK and Kr?• Find potassium (K) and krypton (Kr) on a periodic table. List

their physical and chemical properties.

• Why are these elements on opposite sides of the periodic table?

• Are physical or chemical properties used to organize the periodic table?

Periodic Table of Elements: TEKS 8.5C

Time to investigate!• Complete the lesson investigation:

– The Periodic Table

Periodic Table of Elements: TEKS 8.5C

Organization of the periodic table• The periodic table is organized in order

of increasing atomic number.

• Each horizontal row is called a period.Across a period, chemical properties gradually change.

• Each vertical column is called a group. Groups have similar chemical properties.

• Main group elements are groups 1–2 and 13–18. Transition elements are groups 3 through 12.

• The inner transition elements, called lanthanides and actinides, are usually placed below the table.

Periodic Table of Elements: TEKS 8.5C

The periodic table

Periodic Table of Elements: TEKS 8.5C

More about organization• Groups of the periodic table include the

alkali metals (group 1), group 2 elements,halogens (group 7), and the noble gases (group 8).

• Metals are typically shiny, opaque, and good conductors of heat and electricity.

• Nonmetals are poor conductors of heat and electricity.• Metalloids are metals that are moderate conductors of heat

and electricity. They are on the border between metals and nonmetals.

• The periods (rows) of the periodic table correspond to the energy levels in an atom.

Periodic Table of Elements: TEKS 8.5C

Time for Practice!

• Complete the lesson practice activity:– The Periodic Table

Periodic Table of Elements: TEKS 8.5C

Show what you know!

• Try the lesson’s interactive quiz, or complete a quiz that your teacher can print out for you.

• Hint: – You might want to review your

lesson reading piece one moretime before trying the quiz.