Periodic Table of Elements Essential Questions:

1. What is the PTE?

A chart of elements arranged into rows and columns according to their physical and chemical properties.

2. How is the PTE organized?

Today, the periodic table organizes the elements in horizontal rows, or periods, by order of increasing atomic number, which equals the number of protons in the atomic nucleus of each element.

3. What is the PTE purpose?

The purpose of the PTE is to arrange elements according to reactivity behavior, molecular weight and atomic number, to make classification easier and organized.

4. What characteristic properties classify elements as metals, nonmetals and metalloids?

Metals – shiny, ductile, malleable, good conductor of electricity and thermal energy, has luster, all solids at room temperature (except mercury)

Nonmetals – most are gases at room temperature, those that are solid at room temp have a dull luster and are brittle, poor conductors of heat and electricity

Metalloids – acts a a semiconductor, at high temperatures they are good conductors of electricity, at low temperatures stops electricity from flowing

5. What significance do the elements play in our daily life?

Chemistry is all around us. We use it in the kitchen while cooking (chemical reactions), and we even use it in when dying our hair. There are many elements that we use everyday

Word / Definition / Picture
1. Periodic Table of Elements / A chart of elements arranged into rows and columns according to their physical and chemical properties. /
2. Dmitri Mendeleev / Russian chemist that discovered the PTE /
3. Henry Moseley / His work led to a revision of the periodic table by rearranging the elements by their atomic numbers. /
4. metals / Elements found to the left of the zig zag line on the PTE. Has characteristics such as malleable, ductile and good conductors of electricity. /
5. nonmetals / Elements found to the right of the zig zag line on the PTE. Gases at room temperature, solid at room temp, have a dull luster, poor conductors of heat and electricity, good insulators /
6. metalloids / Elements that are found bordering the zig zag line. Acts as a semiconductor, at high temperatures they are good conductors of electricity, at low temperatures stops electricity from flowing /
7. ductile / The term used to describe a material that can be pulled out into a long wire. /
8. malleable / A term used to describe material that can be pounded into shapes /
9. periods / A horizontal row of elements in the Periodic Table of Elements. /
10. groups/families / Elements in the same vertical column of the periodic table /