1. Periodic Table of Elements
Metals, nonmetals, and metalloids
Periodic Table of Elements

2. Objectives: Understand how scientists organize the elements
Learn about the properties of metals, nonmetals, and metalloids

3. Dimitri Mendeleev
Given credit for creating the first periodic table in 1869
He arranged the elements according to the atomic mass
He was able to predict the existence of other elements

4. Periodic Properties
Mendeleev noticed that a pattern of properties appeared when he arranged them
Properties repeat regularly

5. How is this useful?
An element’s properties can be predicted from its location on the periodic table
Periods are horizontal rows – shows how many electron energy levels an element has

6. Useful ctd…
The modern periodic table has 7 periods that form 18 columns
The columns are called groups, or families

7. Metals Luster – shiny Malleable – able to be hammered into shapes
Ductile – able to be drawn into wire
Good conductors of heat and electricity
Most are solid at room temperature

8. Nonmetals Nonmetals are found on the right side of the stairstep line
Poor conductors
Brittle – will shatter if hammered
Dull – not shiny

9. Metalloids Have some properties of metals and nonmetals
Brittle, hard, and somewhat reactive
Most useful property is the ability to conduct electric current – used to make computer chips

10. What am I? This element is a solid Is a good conductor of heat
Used to make silverware

11. What am I? This element is a solid This element is a poor conductor
Found in every organic molecule
Found in jewelry

12. What am I? This element is a liquid
This element is poisonous to humans
This element is a good conductor
This element is shiny

13. What am I? This element is a liquid This element is a poor conductor
This element is very reactive with metals

14. What am I? This element is a gas This element is a poor conductor
This element not reactive at all

15. What am I? This element is a solid
This element is a poor conductor of heat
This element is a good conductor of electricity
This element is brittle