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He was a German Chemist. In 1810, he was eventually the
professor at the University of Jena.
He discovered similar triads of elements in 1829.
In 1817, He discovered the group of elements. He found out that Lithium, Sodium and Potassium had similarity.
Johann Wolfgang Dobereiner
LookAtThis Sexy Beast!!
Triads are some of the first families of elements with similar chemical properties.
There were three in the group.
Their appearance and reactions of the elements were similar to each other.
WHAT ARE THE TRIADS?
Alkali formers
Li 7
Na 23
K 39
Salt formers
Cl 35.5
Br 80
I 127
He began working on the Periodic Table in the late 1860s.
He arranged 63 elements known by there atomic weight.
He also organized them into similar properties.
This is his first sketch of the Periodic Table.
Dmitri Mendeleev
MENDELEEVS’ PERIODIC TABLE
Current Periodic Table
The End….
By: Ashley Olivera
Brittany SpishockJoey Rice
By: Morgan Williams&
Brooke McKenna
ARRANGEMENT OF THE PERIODIC TABLE
A period is a horizontal column on the periodic table of elements.
There are 7 periods on the periodic table.
And a group is a column that is vertical.
There and 18 groups on the periodic table.
Periods and Groups
Groups are numbered in 2 ways, one way is 1-18 which includes all elements even the transition metals.
The second way is 1A-8A they’re known as the main groups.
More on Groups
Lanthanides- inner transition elements with atomic numbers 58-71, lanthanides are located in the top row of the f block.
Actinides- inner transition elements with the atomic numbers from 90-103; all are radioactive, actinides are located in the bottom row of the f block.
Transition elements- elements in groups 3-12 all are metals, transition elements are located in the D-block.
Lanthanides, Actinides, and Transition Elements
Solids- definite shape and volume Liquid- no definite shape, but definite
volume Gas- no definite shape or volume
3 states of matter
There are 2 liquids There are 11 gases
Noble gases are generally located on the right side
The rest are solids
http://www.dayah.com/periodic/
Solids, Liquids, and Gasesof the periodic table
By: Mike Ross, Shelby Fausey, and Kaitlyn Carl
Periodic Table
ARRANGEMENT OF THE PERIODIC
TABLE
Definitions Metal- Element that has luster, conducts heat
and electricity and usually bends without breaking.
Non-metal- Does not conduct heat or electricity. Brittle when solid. Many are gases at room temperature.
Metalloid- Element with some physically & chemically properties of metals and other properties of non-metals.
Metal Metals are located on the left side of the black
outlined step looking line. There are 61 metals on the periodic table. Examples of metal are silver, copper, iron, and
cobalt. They are used for machinery, coins, and automobiles.
Non-metals
Non-metals are located on the right side of the black line.
There are 18 non-metals on the periodic table
Sulfur, Chlorine, Iodine most are gases, one is a liquid (Bromine)
and the rest are solid.
Metalloids Metalloids are located on the either side of the
black line. There are 7 metalloids on the periodic table. Boron, Silicon, and Germanium are examples
of metalloids Metalloids are used mostly in transistors.
Group 1A
Group 1A is the Alkali Metals Alkali Metals are soft and usually have low
melting points and densities. They are also powerful reducing agents.
All react violently with water, and tarnish rapidly even in dry air. They are never uncombined in nature.
Alkali metals are sometimes used in explosives.
Group 2A Group 2A elements are the Alkaline Earth Metals. These metals are silvery colored, soft, and react
readily with halogens. They then form ionic salts. Magnesium and calcium are essential elements
for all living organisms.
Transition Elements
These elements are in groups 3-12 , all are metals.
Some transition elements are Scandium, Titanium, and Vanadium.
They are also known as transition metals. They are very hard and have high melting points and boiling points.
Transition elements are used for structural materials, copper pipes, and coins.
ARRANGEMENT OF THE PERIODIC
TABLEMegan Clark
Megan Slonaker
Zack Dorman
Group 3A elements• Boron: It is classified as a Metalloid, used in flares,
and nuclear reactor control elements.• Aluminum: light, but very strong, and is used in
kitchen utensils and aircraft industries.• Gallium: liquid in room temp, has a silvery
appearance, low vapor pressure. It’s a by product of aluminum. Also used in LED lights.
• Indium: Found in ores of zinc and tin. Used in making bearing alloys, rectifiers, and are used in making mirrors.
Group 3A cont. And Pictures
Thallium: Very soft metal, it can be cut by a knife, and its toxic. It is also in arsenic.
Boron
Aluminum
Gallium
Pictures of Group 3A
INDIUM
Thallium
Group 4A Elements Carbon: Dense, and black in color.
Found in diamonds. Silicon: Most abundant element on
earth, other than oxygen. It is a natural semiconductor. Used in steel.
Germanium: It is a grey-white metalloid. Germanium is used in electric guitar amps.
Tin: Silvery, malleable element. Tin is used to coat other metals to prevent corrosion.
Lead: Silvery-grey in appearance. It is used in some paints, and in pencils.
Group 4A Pictures
CarbonSilicon
Group 5A Nitrogen: It means without life, also it is 78.1% or
earths air. Nitrogen is also found in all living systems.
Phosphorus: A large amount of it is found in bones.
Arsenic: It can kill you, it can also cause cancer. Antimony: Toxic, poor conductor of heat and
electricity. It is found in batteries, lead, and antifriction alloys.
Bismuth: Used in cosmetics and medical procedures. Its lustrous and pink.
Group 5A Pictures
Nitrogen Phosphorus
Arsenic AntimonyBismuth
Group 6A Elements
Oxygen: Colorless gas, and a light blue liquid. We breathe it, and found in water.
Sulfur: A yellow, odorless crystal. Its found near volcanoes.
Selenium: Grayish black in color. Used in making rubber and steel alloy.
Tellurium: Silvery grey in color. Used in alloys like lead and copper, and stainless steel.
Group 6a pictures
SulfurOxygen
SeleniumTellurium Polonium
Group 7A elements Fluorine: Yellowish brown gas. Used in flat
panel display system, and Teflon. Chlorine: It’s a gas, yellow green in color.
Used in cleaning products. Bromine: Liquid at room temperature,
brownish- red color. Found in alternative chlorine for pools.
Iodine: Bluish- black in color. Found in table salt.
Astatine: Highly unstable radioactive element.
Group 7a Pictures
FluorineChlorine
Bromine Iodine Astatine
Group 8A elements
Helium: The only element that cannot be frozen in very low temperature. Used in balloons.
Neon: Its colorless, but it glows reddish orange in an electric discharge. Used in displays, and indicators.
Argon: It’s a colorless, odorless gas, that makes up 1 percent of the Earths atmosphere. Used in electric light blubs.
Krypton: Whitish in color. Used in fluorescent bulbs.
Group 8a elements and pictures
Xenon: It’s a gas at room temperature. Used in laser-pumping lamps.
Radon: A gas that’s found in the Earths crust.
Helium NeonArgon
Group 8a pictures
Krypton Xenon
Radon
Lanthanide It is the inner transition elements with
the atomic number 51-71 It is also known as a rare earth metals. Bright silvery appearance
Actinide Inner transition elements with the atomic
number from 90-103 Actinide is radioactive
TREND ON THE PERIODIC TABLE
By Casey Higgins, Shanee Hay, Matthew Hayes
Reactivity
The tendency of a substance to undergo chemical reaction, either by itself or with other materials, and to release energy
Reactivity increases when you go down the group and decreases when you go left to right.
Density
• Mass per unit volume of a substance.• D=mass/volume• Density increases as you go down the
group.
Atomic radius
The size of an atom. Moving left to right Atomic radius
Decreases and moving top to bottom atomic radius increases .
Ionized energy
Energy required to remove an electron from a specific atom.
moving left to right ionized energy increases and moving top to bottom ionized energy decreases.
Electronegativity
A chemical property that describes the ability of an atom to attract electrons towards itself in covalent bond.
Moving left to right electronegativity increases and moving top to bottom electronegativity decreases.
