Technetium

Physical Properties

Technetium is a solid.

Melting Point: 2157 celsius, 3915 fahrentheit.

Denisty:11 g. cm

Urainum

Uraium, U
webelements.com

Physical Properties:Is a silver -white metallic chemical element it has 92 protons It can also have about 141 and 146 neutrons, urainum has the highest atomic weight of the naturally occuring elements
Boiling point:4404 K
Melting point:1405.3
Density:17.3g.cm-3
Phase:solid

Urainumas discover by a German scieties named Martin Klaprothy in 1789. Uranium is the last heaviest of the natural elements.The ownership and sale of uranium are stricty controlled by the U.S. Nuclear Regulatory Commission.It is now found in many menerals, including pitchblende. uranite, "yellow cake", and manazite sands.
Christian m, Domenech

Potassium

BACKGROUND

(WHO DISCOVERD THIS ELEMNT AND WHEN)

POTASSIUM IS ONE OF THE MOST COMMON ELEMENTS IN EARTH'S CRUST BUT YOU ARE UNLIKELY TO FIND IT AS AN EEMENT IN NATURE. THIS SOFT SILVERY WHITE MEDAL IS SO REACTIVE THAT IT ALMOST ALWASY EXSITS COMBINED WITH OTHER ELEMENTS AS COMPOUNDS. POTASSIUM IS THE SEVENTH MOST COMMON IN EARTHS CRUST AFTER OXYGEN,SILICON, ALUMINUM ,IRON,CALCIUM AND SODUIM

chlorine

Chlorine is a naturally-occurring chemical element one of the basic building blocks of matter.Chlorine chemistry provides clean drinking water to millions around the globe .Clean drinking water made possible with chlorine desinfectants is a monumental trimuph over the scouges of waterborne disease.chlorine was discovered in 1774 by a swedish karl wilhem scheele.the name of the element,chlorine. chlorine can be found on manny different locations all over the world.chlorine is always found in compounds because it is a very roactive element.

Brenda Ordonez

Iron (Fe)

Iron (Fe)

www.webelements.com

Physical Properties:

Color:silver

Phase: solid @ room temperture

Melting point: 2,795 degree F., 1,535 degree C., 1,808 K.

Boiling point:4,795degree F. , 1,535 degreeC., 3,023 K.

Density: 7.86 g/cm3 @ 1 atm

Atomic symbol: Fe

Protons: 26

Electrons:26

Neutrons:30

Atomic number: 26

Atomic mass: 55.845

Background : (Who discovered this element? where? when?)

By: Melissa Francois

NItrogen(N)

Atomic Number-7
Atomic Mass-14.00674

Physical Properties
Nitrogen is a gas.
Melting Point-6329
Boiling Point-77.4

Nitrogen is found in the stars and the in the sun. All plants and animals have Nitrogen. Nitrogen is used for explosives they are also used to make fertilizers.

*Elmer Tinoco*