Why Francium is the biggest element with the lowest IE and EN
Francium is the biggest element because it has seven shells of electron, which they are weakly attracted. This tells Fr to give away electron easily inorder to have a full valence shell, which is making Fr's IE very low. Fr have a weak attraction which means it cannot pull other electrons in their shells, which makes Fr's EN very low as well.
Why Helium is the smallest element with the highest IE?
Hellium has only one shell, and the smallest element. Helium is a nobel gas, its valence shell is already full. It is holding its electrons closest and it takes the move IE to split them away from the nucleus.
Why Noble Gases don't have EN values
Noble gas already have full valence shell, so they do not gain electrons.
Why Fluorine has the highest EN
Flourine is not a full shelled element, and it is the smallest halogen in the halogen column, it has a very strong attraction to its electrons.
Thursday, October 7, 2010
Tuesday, September 14, 2010
Lead is Element # 82
1.My name is Plomb in French, Lood in Dutch and Lead in English. My symbol Pb is an abbreviation of its Latin name plumbum for soft metals; originally it was plumbum nigrum, where plumbum candidum was tin. The English word ''plumbing'' also derives from this Latin root. The chemical symbol for me is Pb which is from the Latin word plumbum.
2.When I am in a pure element form, I look like bluish-white lustrous metal. I am very soft, highly malleable, ductile, and a relatively poor conductor of electricity.
3. I have 82 protons and 126 neutrons in my nucleus in my most common isotope. One of my naturally occurring isotope is Pb-204, their half-live is ≥ 1.4×10+17 years, their natural abundance is 1.4%. My average atomic mass is 207.2.
![[Bohr Model of Lead]](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_sbY_pyMKKs3YSZAl7PC_rnJXcu8d73fFs1PLv2i6hybPGh3dfI3JsB9lvFbL8Ltl6gNuhu1OJDv57i4T4kEvy8_--yaf3UVc2laRNoU0-HZw=s0-d)
4. I have 82 electrons in a neutral atom of my element. And i have 6 shells of electrons.
5.My atomic radius is 180pm, which is 18(-11)m.
6. I have a blue-gray color. It is a softest tand heaviest of the common metals. It is very malleable and ductile, but has no elastic strength, and its tensile strength is so low that it cannot be drawn readily into fine wires. It is a poor conductor of heat and electricity. On account of its softness it can be readily squeezed through a press and thus shaped into rods or pipes. It melts at about 600 F.
7.In average, about 0.07718grams of lead contain in a 100 lb human body. I make up only about 0.0013% of the earth's crust, it is not considered to be a rare element since it is easily mined and refined.
8.Compound from by me are
Plumbane 
Lead Difluoride
Lead tetrafluoride
9.Lead has been known since ancient times. It is sometimes found free in nature, but is usually obtained from the ores galena (PbS), anglesite (PbSO4), cerussite (PbCO3) and minum (Pb3O4). Leadead is found in archeological digs dating over 5000 years ago which means that people knew how to refine it before the pyriamid in Egypt were built.
10.Lead exposures leading to high blood lead levels, can be treated with medicines to remove lead from the body and reduce the damage to target organs. We do not know whether these medicines work to prevent health problems in persons who had lower exposures to lead and who now have lead in their bones.
11.Lead is one of the ancient metals, having been known since before recorded history. It's one of the few metals that can be found in metallic form in nature (rather than in compounds that must be reduced to get metal). Lead plumbing pipes from the Roman empire are still in use. In fact the word "plumbing" comes from "plumbum", the Latin name for lead which also give it its symbol, Pb.
Lead is mainly known for being soft and heavy. It is both those things, but it's far from the softest, or the heaviest, metal. Gold is almost twice as heavy, but of course you rarely have very much all in one place, so people don't usually notice how heavy it is. Indium is much softer, but most people have never even seen any, let alone dented it with their fingernails
12. Reference: http://www.webelements.com/ http://en.wikipedia.org/wiki/Lead
http://physics.nist.gov/PhysRefData/Handbook/Tables/leadtable1.htm
2.When I am in a pure element form, I look like bluish-white lustrous metal. I am very soft, highly malleable, ductile, and a relatively poor conductor of electricity.
3. I have 82 protons and 126 neutrons in my nucleus in my most common isotope. One of my naturally occurring isotope is Pb-204, their half-live is ≥ 1.4×10+17 years, their natural abundance is 1.4%. My average atomic mass is 207.2.
4. I have 82 electrons in a neutral atom of my element. And i have 6 shells of electrons.
5.My atomic radius is 180pm, which is 18(-11)m.
6. I have a blue-gray color. It is a softest tand heaviest of the common metals. It is very malleable and ductile, but has no elastic strength, and its tensile strength is so low that it cannot be drawn readily into fine wires. It is a poor conductor of heat and electricity. On account of its softness it can be readily squeezed through a press and thus shaped into rods or pipes. It melts at about 600 F.
7.In average, about 0.07718grams of lead contain in a 100 lb human body. I make up only about 0.0013% of the earth's crust, it is not considered to be a rare element since it is easily mined and refined.
8.Compound from by me are
- Lead difluoride: PbF2
- Lead tetrafluoride: PbF4
- Plumbane: PbH4
Plumbane Lead DifluorideLead tetrafluoride9.Lead has been known since ancient times. It is sometimes found free in nature, but is usually obtained from the ores galena (PbS), anglesite (PbSO4), cerussite (PbCO3) and minum (Pb3O4). Leadead is found in archeological digs dating over 5000 years ago which means that people knew how to refine it before the pyriamid in Egypt were built.
10.Lead exposures leading to high blood lead levels, can be treated with medicines to remove lead from the body and reduce the damage to target organs. We do not know whether these medicines work to prevent health problems in persons who had lower exposures to lead and who now have lead in their bones.
11.Lead is one of the ancient metals, having been known since before recorded history. It's one of the few metals that can be found in metallic form in nature (rather than in compounds that must be reduced to get metal). Lead plumbing pipes from the Roman empire are still in use. In fact the word "plumbing" comes from "plumbum", the Latin name for lead which also give it its symbol, Pb.
Lead is mainly known for being soft and heavy. It is both those things, but it's far from the softest, or the heaviest, metal. Gold is almost twice as heavy, but of course you rarely have very much all in one place, so people don't usually notice how heavy it is. Indium is much softer, but most people have never even seen any, let alone dented it with their fingernails
12. Reference: http://www.webelements.com/ http://en.wikipedia.org/wiki/Lead
http://physics.nist.gov/PhysRefData/Handbook/Tables/leadtable1.htm
Friday, August 27, 2010
Subscribe to:
Posts (Atom)