Iodine

 blake - 4/22/2010 9:13:18 PM

Can someone answer this. An element has 4 protons, 5 neutrons, and 4 electrons. What is the atomic mass of the element?

 Krissy - 2/23/2010 10:11:16 PM

	Dick chioma - 4/10/2009 9:34:54 AM
	What are the characteristics of iodine and its effects to human.

what are th chemical properties of Iodine

anonymous - 1/26/2010 3:52:26 PM

how much is the cost for idoine per gram

 ashlee - 11/30/2009 5:48:38 AM

iodine symbol=I iodine number=53 atomic mass=126.90447 non-metallic neutrons=74 protons/electrons=53 cost=$8.03 per 100g invented by=Bernard courtois in 1811

 delshonna - 11/17/2009 8:11:46 PM

what is the answer for the cost of iodine

 Dick chioma - 4/10/2009 9:34:54 AM

	Samantha - 12/20/2005 1:34:29 AM
	Iodine has 74 neutrons, 53 protons, and 53 electrons. if you need more info e mail me im doind a project on Iodine so i know alot of stuff about it.

What are the characteristics of iodine and its effects to human.

 karmen - 2/20/2009 7:50:32 AM

how much does the iodine cost for i gram

julian - 2/9/2009 4:08:42 PM

	adriana - 11/12/2008 2:57:15 AM
	what r interesting facts on iodine, whats in normal phase, how much does it cost, what is it classified as, whats in origin of name, who discovered it

it's normal phase is a solid.

piper - 12/4/2008 7:33:10 PM

how much does it cost, normal phase, and some interesting facts about it?

 adriana - 11/12/2008 2:57:15 AM

what r interesting facts on iodine, whats in normal phase, how much does it cost, what is it classified as, whats in origin of name, who discovered it

anonymous - 10/25/2008 1:14:59 AM

how much does iodine cost?

 sara - 10/2/2008 4:46:58 PM

what are some interisting facts about iodine

matt - 9/16/2008 12:39:12 AM

	Nene - 12/6/2007 5:43:20 PM
	How much does iodine cost?

3$ per ounce

 Jordan - 4/14/2008 10:25:12 PM

what are some interesting facts about iodine?

 tyler - 3/3/2008 10:57:02 AM

	tyler hinton - 4/19/2007 9:59:27 PM
	how much dose iodine cost

$3 an ounce

 lizzie - 2/20/2008 5:17:44 PM

	Nene - 12/6/2007 5:43:20 PM
	How much does iodine cost?

$3 an ounce

 kristen - 2/5/2008 10:11:32 PM

how can iodine be isolated as a substance?

 calvin - 12/14/2007 4:44:43 AM

Iodine

Chemical Symbol- I Melting Point: 386.85 K (113.7°C or 236.7°F)
Atomic Number-53 Boiling Point: 457.55 K (184.4°C or 364.0°F)
Atomic Mass- 126.9 Phase at Room Temperature: Solid
Group- 17 (halogens) Density- 4.93 grams per cubic centimeter Election Configuration- 2, 8, 18, 18, 7

Iodine (means violet) was discovered by Barnard Courtois in 1811. He was the son of a manufacturer of saltpeter (potassium nitrate, a vital part of gunpowder). At the time France was at war and gunpowder was in great demand. Saltpeter was isolated from seaweed washed up on the coasts of Normandy and Brittany. To isolate the potassium nitrate, seaweed was burned and the ash then washed with water. The remaining waste was destroyed by adding sulfuric acid. One day Courtois added too much sulfuric acid and cloud of purple vapor rose. Courtois noted that the vapor crystallized on cold surfaces making dark crystals. Courtois suspected that this was a new element but lacked the money to pursue his observations.
However he gave samples to his friends, Charles Bernard Desormes (1777-1862) and Nicolas Clément (1779-1841) to continue research. He also gave some of the substance to Joseph Louis Gay-Lussac (1778–1850), a well-known chemist at that time, and to André-Marie Ampere (1775-1836). On November 29, 1813 Dersormes and Clément made public Courtois’ discovery. They described the substance to a meeting of the Imperial Institute of France. On December 6 Gay-Lussac announced that the new substance was either an element or a compound of oxygen. Ampere had given some of his sample to Humphry Davy (1778-1829). Davy did some experiments on the substance and noted its similarity to chlorine. Davy sent a letter dated December 10 to the Royal Society of London stating that he had identified a new element. A large argument erupted between Davy and Gay-Lussac over who identified iodine first but both scientists acknowledged Bernard Courtois as the first to isolate the chemical element.

Ultrapure iodine can be obtained from the reaction of potassium iodide with copper sulfate. Several other methods of isolating the element are known. Iodine is a bluish-black, lustrous solid, volatizing at ordinary temperatures into a blue-violet gas with an irritating odor; it forms compounds with many elements, but is less active than the other halogens, which displace it from iodides. Iodine exhibits some metallic-like properties. It dissolves readily in chloroform, carbon tetrachloride, or carbon disulfide to form beautiful purple solutions. It is only slightly soluble in water. Iodine compounds are important in organic chemistry and very useful in medicine. Iodides, and thyroxine which contains iodine, are used internally in medicine and as a solution of KI and iodine in alcohol is used for external wounds. Potassium iodide finds use in photography. The deep blue color with starch solution is characteristic of the free element. Care should be taken in handling and using iodine, as contact with the skin can cause lesions; iodine vapor is intensely irritating to the eyes and mucus membranes. The maximum allowable concentration of iodine in air should not exceed 1 mg/m3 (8-hour time-weighted average - 40-hour).

Iodine was placed in group 17 for having 7 valence electrons and being mostly stable.

 Nene - 12/6/2007 5:43:20 PM

How much does iodine cost?

 Miranda - 11/28/2007 12:07:51 AM

	laura - 10/30/2007 1:05:33 PM
	how many protons,neutrons, and electrons does iodine have.

protons: 53
electrons: 53
neutrons: 74

jose - 11/18/2007 7:46:25 PM

what are interesting facts about iodine?

Sarah - 11/12/2007 7:44:26 PM

Hey I was wondering what are some interesting facts about iodine?

 thojboy - 11/7/2007 7:21:41 PM

how much does Iodine cost?