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  Why does the size of atoms decrease while moving across from left to right in a period within the Periodic Table?

  Posted by cherrybhatnagar on Dec 4, 2009 at 02:38 AM

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  Can you determine which two unknown elements has the largest radius? Explain

  Posted by amazona0125 on Nov 23, 2009 at 12:20 AM

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  How do protons react with the main atom?

  Posted by joemama on Nov 19, 2009 at 07:49 AM

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  What is tripple distilled mercury used for and where?

  Posted by nkobi on Nov 17, 2009 at 12:41 AM

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  Describe the development of the modern periodic table. Include contribution made by Lavoisier, Newlands, Mendeleev, and Moseley.

  Posted by amazona0125 on Nov 16, 2009 at 12:26 AM

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  How is Arsenic made?

  Posted by jmwflakes6 on Nov 7, 2009 at 08:01 AM

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  What are the uses of alkaline earth metal?

  Posted by kemar on Oct 29, 2009 at 04:35 PM

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  How do you figure out the number of neutrons in a atom?

  Posted by vjoane13 on Oct 28, 2009 at 02:13 PM

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  What family is carbon in?

  Posted by lolithamarylopez on Oct 26, 2009 at 02:38 PM

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  Electrons in the third orbital of sulphur are involved in reactions. How many electrons does a sulphur atom have?

  Posted by amazona0125 on Oct 23, 2009 at 06:05 PM

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  What is the purity of triple distilled mercury?

  Posted by hkd on Jun 6, 2009 at 09:18 AM

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  Why do you think mercury is a metal and bromine a non-metal?

  Posted by peshol on May 24, 2009 at 08:54 AM

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  which element has three electrons in its outer most orbit?

  Posted by balasubbaiah on May 3, 2009 at 07:35 AM

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  What are the group names of the periodic table? What are their traits?

  Posted by blueeyeidy on Mar 17, 2009 at 04:07 PM

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  What are the everyday uses of Hydrogen?

  Posted by tylerrxo on Mar 15, 2009 at 11:42 PM

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  Why are Group 1 metals so reactive and what are they called?

  Posted by mike01va on Jan 22, 2009 at 10:19 PM

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  At what temperatures is lithium a solid, a liquid, or a gas?(in metric units only please) 

  Posted by bobfred on Jan 21, 2009 at 05:13 PM

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  What are isotopes? Please explain clearly and in detail.

  Posted by dardasa on Jan 17, 2009 at 03:41 PM

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  The elements in the Periodic Table are arranged from left to right and top bottom based upon what value?

  Posted by alexisjf on Jan 10, 2009 at 09:51 AM

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  If you lower the temperature enough, can all the elements be turned into solids?

  Posted by enotechris on Dec 21, 2008 at 06:45 PM

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  Can all the elements, remaining as elements, turn into solids? Why or why not?

  Posted by enotechris on Dec 17, 2008 at 06:10 PM

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  What 5 elements are liquid on a hot summer day (38 C)?

  Posted by enotechris on Dec 16, 2008 at 04:50 PM

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  Why are the elements Bromine and Mercury liquid at room temperature?

  Posted by leydibug on Dec 16, 2008 at 09:42 AM

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  Why does the element Iron have a variable valency, sometimes Fe+2 and sometimes Fe+3?

  Posted by faro62 on Dec 13, 2008 at 01:19 PM

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  Compare the properties of hardness, melting point, and density among the alkali metals, alkaline earth metals, transition metals, and non-metals.

  Posted by fulla on Dec 9, 2008 at 02:50 PM

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  Why do magnesium, phosphorus, and zinc exhibit slightly higher first ionization energies than the general trend within each of their periods?

  Posted by mjoyner on Dec 7, 2008 at 06:18 PM

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  What is another term for an unreactive element? The letters scrambled up are: ngora.

  Posted by mjoyner on Nov 30, 2008 at 01:14 PM

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  Who discovered hydrogen?

  Posted by mosh1 on Nov 28, 2008 at 11:18 AM

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  What is element #35? Describe its atomic mass, configuration number, and charges. Please explain J.J. Thomson's experiments.

  Posted by soobom on Nov 26, 2008 at 03:49 AM

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  What are the differences between calcium, tin, and aluminum?

  Posted by jessbabe on Nov 20, 2008 at 05:11 AM

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  What are the bonding capabilities for the Alkaline Earth Metals?

  Posted by ciarajoann on Nov 19, 2008 at 05:16 PM

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  What is bohrs law?

  Posted by soobom on Nov 18, 2008 at 01:14 PM

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  What element from the periodic table has the highest monetery value per unit?

  Posted by bigjuan1992 on Nov 18, 2008 at 05:06 AM

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  How could you determine the specific halogen like Cl, Br, I present in your test compound after fusion?

  Posted by joacky on Nov 18, 2008 at 05:05 AM

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  Please tell me about some chemical elements and their Latin names.

  Posted by nnkwachukwu on Oct 19, 2008 at 11:57 AM

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  at room temperature, are alkine metals a gas, solid, or liquid

  Posted by loganboo on Oct 2, 2008 at 06:06 PM

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  Why the metallic or non metallic character of elements vary depending upon their position in the periodic table?

  Posted by isabellajone on Oct 1, 2008 at 02:53 AM

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  How do you make an element?

  Posted by amazona0125 on Sep 10, 2008 at 04:10 PM

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  What does the symbol B stand for in the periodic table?

  Posted by barbie94288 on Apr 8, 2008 at 09:41 PM