7th Grade Science Homework Help?!?!?
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if it forms a 2- ion it is from the Chalcogen (group V1(A) or 16) family (Oxygen, Sulphur, ...).  The two bonds between two Oxygen atoms are Covalent.  It has 6 valence electrons and takes two to complete the valence shell (noble configuration).\n\nThe reaction of X with Sodium (Na) will require twice as many Na atoms as Sodium only has 1 valent electron to give (to make the Na+ ion)\n\nSo\n\n2Na + X -> Na2X which in a polar solvent (e.g. water) will become 2Na+ +X2- \n\nFYI, the Halogens are Fluorine, Chlorine etc and only have one single space left to take an electron to reach Noble configuration hence they form singly charged anions F-, Cl-...
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http://www.scioly.org/obb/board.php?FID=35\n\nThis is where I get help for such projects.  If you can't find the information, start a new topic and ask your question.  It is a great science project help site!
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http://www.infoplease.com/homework/
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Check a Science Webquest website and you will find out...:D
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Here is a good site to check out:\n\nhttp://www.all-science-fair-projects.com/\n\nOver 500 topics for all age levels
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I recommend that you do the reading assignment. I am sure that the answer is in there somewhere. If you cannot find the answer there, ask your parents or a classmate for help.
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http://www.all-science-fair-projects.com/\n\nOver 500 of them here. And a really cool colorful web site for someone in the 5th grade to enjoy.\n\nCheers
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Discovery Channel has some nice science project resources.\n\nhttp://school.discovery.com/sciencefaircentral/
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http://www.usoe.k12.ut.us/curr/science/sciber00/7th/classify/living/2.htm
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I suspect this is a homework question. But, you haven't given enough information for someone to answer it. Click the Add Details link and give some background, then maybe someone can help.
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http://www.backwoodshome.com/articles/radabaugh30.html\nhttp://www.all-science-fair-projects.com/science_fair_projects/89/393/42e5f26dcd2e5ccd20cee4891a8e032f.html\nhttp://www.panda.org/news_facts/education/middle_school/homework_help/project_ideas/index.cfm?pjid=2\nhttp://www.worsleyschool.net/science/files/solar/cooker.html
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(m)\n\ngoto the following website for ur answer\n\nhttp://www.usgs.gov/science/science.php?term=650
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http://www.studentquestions.com/homework_ans/4244.html
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try wikipedia or any science related source
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http://www.pa.msu.edu/sciencet/ask_st/111192.html
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This site should help you.\n\nhttp://sparknotes.com/chemistry\n\nGood luck.
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Below is a website through Yahoo! just for science fair project ideas, etc.  I hope this helps.