Essays Tagged: "Atomic mass"

Uranium.

Uranium.Uranium was discovered in the 1700's in the coal mines of bohemia and Jachlovikna.Uranium's atomic number is 92, its Symbol is U and the atomic mass of uranium is 238.0289. Miners called it Pe ... deleev in his famous perodical classification of the elements by chemical properties and increasing atomic mass.Experimentation with uranium lead to many discoversies such as the X-ray byWilhelm R&oum ...

(2 pages) 44 0 3.7 Apr/1997

Subjects: Science Essays > Biology

Uranium.

Uranium.Uranium was discovered in the 1700's in the coal mines of bohemia and Jachlovikna.Uranium's atomic number is 92, its Symbol is U and the atomic mass of uranium is 238.0289. Miners called it Pe ... deleev in his famous perodical classification of the elements by chemical properties and increasing atomic mass.Experimentation with uranium lead to many discoversies such as the X-ray byWilhelm R&oum ...

(2 pages) 53 0 4.3 Apr/1997

Subjects: Science Essays > Chemistry

Chlorine

rr or 6.8 atmospheres, at 20 C (68 F), and has a very disagreeable odor. It's Element Symbol is Cl, atomic number is 17, and atomic mass is 35.453. Chlorine's melting point is -101 C or 149.8 F. The b ...

(2 pages) 66 0 4.3 Sep/1996

Subjects: Science Essays > Chemistry

Lead and environment

rld's most useful substances, and one that never ceases to find a role inhuman society.Lead has the atomic symbol of Pb (for plumbum, lead in Latin). The atomic numberfor lead is 82 and the atomic mas ...

(3 pages) 87 0 5.0 Feb/1997

Subjects: Science Essays > Environmental Science

A basic outline of the Element Iron. Useful for replacing a lab on Iron (if so instucted), or as a brief history of Iron.

Irons periodic identification is "FE". Iron has an atomic mass of 55.845 AMU and its atomic number is 26. The melting point for iron is 1535.0 °C ( ...

(2 pages) 76 1 3.7 Mar/2003

Subjects: Science Essays

Detailed description on the Element Iridium.

Iridium reportIridium is a metallic element of the platinum group with the atomic number 77 , atomic mass 192.2, boiling point at about 44oo degrees celcuis (7952 degrees fari ...

(1 pages) 33 1 3.0 Sep/2003

Subjects: Science Essays > Chemistry

This essay is about the element Plutonium. It describes the history, the uses-past and future, all isotopes of this material, apperance, electron configuration, and the half life.

u". Plutonium is one of the transuranium elements in the actinide series of the Periodic Table. Its atomic number is 94. Plutonium has an atomic mass of 244 and a density of 298K. Pu melts at 914 degr ... 3, 244, 245a, 246, 247. It boils at 3505 degrees Kelvin and it has a specific heat of J/gK .13. The atomic radius is A- and the electron configuration is [Rn]7s25f6. At room temperature, plutonium app ...

(2 pages) 168 9 4.3 Dec/2003

Subjects: Science Essays > Chemistry

What are the uses, facts, history, and properties of the element known as Aluminum?

General StatisticsName: AluminumSymbol: AlAtomic Number: 13Atomic Mass: 26.981539 amuDensity: 2.702 g/cm3Melting Point: 660.37 °C...

(2 pages) 37 0 4.0 Dec/2003

Subjects: Science Essays > Chemistry

Radioactivity.

tivityBy: lilticklemeelmo_23Radioactivity a.k.a. radioactive decay, is the steps taken in which the atomic nuclei of unstable isotopes release fast-moving particles and energy. There are three types o ... atom. There are two ways radiation can travel either as particles or waves. It does not change the atomic mass or the atomic number of the atom that was formed. If it travels through a human body, it ...

(1 pages) 37 0 3.7 Jan/2004

Subjects: Science Essays > Chemistry

Iron- about its elemental properties and history of the metal.

is a silvery metal and its nuclei are extremely stable. Its symbol on the periodic table is Fe. Its atomic number is 26 and its atomic mass is 55.845. Its melting point is 1535 degrees Celsius and its ...

(3 pages) 30 0 5.0 Feb/2004

Subjects: Science Essays > Earth Sciences > Geology & Geosciences

Chemical Properties of the element Barium

th other elements it becomes quite useful. Located in the alkaline earth metal group, Barium has an atomic number of 56 and has an atomic mass of 137.327. The mass is made up of 56 protons and 81 neut ...

(2 pages) 63 0 4.3 Feb/2004

Subjects: Science Essays > Chemistry

Information about Radon. Answers how it's used, where it's found, etc.

e that we use today. He lined up all of the known elements and then put them in increasing order by atomic mass, leaving room for those that he predicted were missing. There were some errors in Mendel ... rrors in Mendeleev's periodic table, however. When the elements are arranged in order of increasing atomic mass, several elements appeared out of place. Years later, Henry Moseley, a British scientist ...

(3 pages) 28 0 0.0 Mar/2004

Subjects: Science Essays > Chemistry

PLATINUM report

a very pretty white silvery metal. Its has many isotopes that range from 190Pt to 198Pt. Platinum's atomic mass average is 195.08 amus. Platinum's place on the periodic table is period number 6, group ... inum's place on the periodic table is period number 6, group number 10. Platinum has a fairly large Atomic number it is 78.Platinum's elemental forms are nuggets and grains. Unfortunately platinum has ...

(1 pages) 25 0 3.2 Apr/2004

Subjects: Science Essays > Atmospheric Sciences

Historic development of the atom and its implications

atoms of different substances were different to each other, particularly because they had different atomic mass.Dalton's theory lead him to also suggest that compounds consisted of different elements ... t his model was incorrect. Thomson in 1904 put forward a model, which suggested that there were sub-atomic particles. Thomson suggested the atomconsists of a positively charged fluid in which negative ...

(5 pages) 34 0 4.0 May/2004

Subjects: Science Essays > Chemistry

Chemistry 10 Notes on Atomic Structure and Half Life.

Atomic Structure Atom: smallest particle of an element that can exist by itself Main 2 ... 1/1839 (1/2000) Not taken into account cuz it doesn't make a difference in total mass Atomic # = # protons & electrons (if neutral) Atomic Mass = # protons + # electrons ... ; neutrons Becomes more stable Writing Elements Write Symbol Top left = atomic mass Bottom left = atomic # Sometimes omitted (implied by symbol) Old Wa ...

(1 pages) 16 0 0.0 Sep/2004

Subjects: Science Essays > Chemistry

Group 14 of the Periodic Table of The Elements.

-General summary of elementsCarbonSymbol - CAtomic Number- 6Atomic Mass- 12.0Electrons per shell- 2, 4Carbon is a solid, non-metallic element th ... Earth's magnetic field, which acts to shield out the radiation that produces 14C.Silicone Symbol-Si Atomic number-14 Atomic Mass- 28.1 Electrons per shell- 2, 8, 4Silicone is most commonly known for i ... ths of infrared and has been used in lasers to produce coherent light at 456nm.Germanium Symbol- Ge Atomic mass-72.64 Atomic number-32 Electrons per shell- 2, 8, 18, 4Germanium, a naturally occurring ...

(5 pages) 22 0 3.0 Nov/2005

Subjects: Science Essays > Chemistry

The Periodic Table of Elements

forms of chemical behavior. Earlier attempts to list the elements had usually put them in order of atomic mass. Mendeleev's key insight in devising the periodic table was to lay out the elements to i ... of them were indeed discovered and fitted the predictions well. With the development of theories of atomic structure it became apparent that Mendeleev had listed the elements in order of increasing at ...

(1 pages) 1221 1 2.0 Apr/2006

Subjects: Science Essays > Chemistry

Chemestry Notes: - development of periodic table, organization of elements, atomic structure, and modern periodic table, isotopes, summary of chapter

1.1 The development of the periodic tableAtomic number: the number of positive charges or protons in the nucleus of an atom of a given elemen ... tom of a given element, and therefore also the number of electrons normally surrounding the nucleus.Atomic Mass: the mass of an isotope of an element measured in units formerly based on the mass of on ... mass of the carbon-12 atom.Isotope: either of two or more forms of a chemical element with the same atomic number but different numbers of neutrons.Mass number: the number of protons and neutrons in t ...

(3 pages) 18 0 0.0 Oct/2006

Subjects: Science Essays > Chemistry

Carbon Family

has a very high melting point at 3500* C and a very high boiling point at 4827* C. Carbon's atomic mass is 12.0107 amu; it has six protons, neutrons and electrons.Carbon is classified as a non ... sper, and opal. Silicon has a melting point of 1410* C and a boiling point of 2355* C. It's atomic number is 14, it s atomic mass is 28.0855 amu. Silicon has 14 protons, electrons and neutrons ...

(2 pages) 3182 0 0.0 Apr/2001

Subjects: Science Essays > Chemistry

Vanadium

adium The element Vanadium is the 23rd element in the periodic table of elements. It has an atomic number of 23 and an atomic mass of 50.9415. There are two isotopes of natural Vanadium, which ...

(1 pages) 405 0 0.0 May/2001

Subjects: Science Essays > Chemistry