instructional objective: 1.understand the periodic chart 2.learn about valance electrons

Instructional Objective:1.Understand the periodic chart

2.Learn about valance electrons

Discovered by Dmitri Mendeleev in 1869

He arranged the elements in order of increasing atomic number.

Every element is represented by a chemical symbol made up of one or two letters.

Is the scientific shorthand for the element’s name

Is the abbreviated way to write the name of an element

Ex: Carbon – The symbol is C Hydrogen – The symbol is H

Using one capital letter or a capital letter plus one or two small letters.

Is always the first letter of the element name.

Some symbols are the first letter of the name plus another letter from it’s name.

Some symbols are derived from Latin words

Ex: Silver – Symbol is Ag -- Latin name is Argentum

The horizontal rows of elements are called periods

The elements increase by one proton and one electron from left to right.

Vertical columns are known as groups or families

Are numbered 1 through 18. Elements in this group have similar

properties. Ex: Group 11(Copper,silver and Gold) -Same properties like shiny, good

conductor of electricity and heat,

MetalsNonmetalsMetalloids

*are malleable, *ductile, *good conductors of heat and electricity.

*are solids at room temperature.

•tend to be brittle. •are poor conductors of heat and electricity.

•*have a dull luster .

* are elements that have properties of both metals and nonmetals.

* may conduct heat and electricity better than a nonmetal, but not as well as a metal.

*The seven metalloids lie along the zigzag line of the periodic table that separates metals and nonmetals.

Blue squares are the Metals.

Yellow squares are the nonmetals.

Green squares are the metalloids.

electron in the outermost energy level of an atom

It determine most of the chemical properties of an element

Also known as Lewis Dot diagram.

Used to show the Valance electrons.

Use “Dots” to represents the valance electrons.

Use the element’s symbol and show the dots around for the valance electrons.

H Be B

C N O

F Ne

Instructional Objective:1.Identfy the different groups of elements

2.Learn about valance electrons

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Instructional Objective:1.Understand the elements

2.Learn about the groups

Alkali metals:(Group IA) or Group 1

Alkaline earth metals :(Group 2A)or Group 2

Halogens : (Group 7A)or Group 17

Noble gases : (Group 8A)or Group18

The Carbon Family(Group 4A)*Contains a nonmetal, 2 metalloids and two metals.The Nitrogen Family(Group 5A)*Contains 2 nonmetals, 2 metalloids and one metalThe Oxygen Family (Group 6A)* 3 nonmetals, 2 metalloids *Oxygen is the most abundant element

found in group 1 of the periodic table are very reactive metals They are all soft metals, easily cut

with a knife. do not occur freely in nature have only one electron in their outer

shell are softer than most other metals can explode if they are exposed to

water. Lithium ,Sodium ,Potassium ,Rubidium,

Cesium ,Francium are the alkali metals.

found in the second group of the periodic table

are very reactive metalsdo not occur freely in naturehave only two electrons in their

outer shellBeryllium ,Magnesium

,Calcium ,Strontium, Barium ,Radium .

are five non-metallic elements found in group 17 .

The term "halogen" means "salt-former . compounds containing halogens are called

"salts". All halogens have 7 electrons in their outer

shells The halogens exist, at room temperature, in

all three states of matter: solid, liquid and gas

Solid- Iodine, Astatine Liquid- Bromine Gas- Fluorine, Chlorine

are found in group 18 of the periodic table

have the maximum number of electrons possible in their outer shell

(2 for Helium, 8 for all others) The electron number make them stable.

Helium ,Neon ,Argon ,Krypton ,Xenon ,Radon

groups 3 through 12 of the periodic table are called "transition metals".

Representative elements are Groups 1 & 2 on the left and Groups 13 - 18 on the right

1a through 8a

are made up of two series of elements, the Lanthanide and Actinide Series.

One element of the lanthanide series and most of the elements in the actinide are synthetic or man-made.