I am having our exam on next day.Pls tell me a trick to study the valencies of elements.?
116173
The position of the elements in the periodic table gives you clues about the valences of each element. Also, if you remember the formulae for familiar substances (like carbon dioxide, water, sulfur dioxide, hydrochloric acid, etc) that will also give you clues about possible or likely valences. \n\nThe final answer is:\n\nmemorize.
631387
A few things I did when I was studying:\n\n1. Visualize the reactions as animated. Try to actually imagine the atoms/molecules detaching from so-and-so location and going to the other. Makes it easier to spot patterns across different reactions.\n\n2. Study a few of the toughest bits right before you go to bed. Your subconscious tends to latch on to whatever you are thinking about when you go to sleep, so the next morning, you'll find those parts easy to understand. This really works, and not only for Organic Chemistry.\n\n3. Another user has suggested Flash Cards. I'd prefer 'cheat sheets' - complete sheets of paper with concise descriptions of the toughest bits, glued to your bathroom mirror or kept at your dining table to casual referral whenever you happen to pass that way. \n\nHope this helps. Best of luck for your final!
974811
This is an answer I gave a few weeks ago. It helped me to get from failing Chemistry to University....maybe it will help you to understand the periodic table as well.\n\nMy Chemistry teacher taught me a great story which helped me learn the elements, which groups they were in, which periods, how many electrons they had etc and resulted in me going from a grade F to B. Every kid should learn this.\n\nHorrible Hairy Little Begger Boys Catch Newts On Friday Near Naples, Magnificent Albert Sits Planning Some Clever Arrangement Keeping Calm.\n\nOk, looks crazy until you break it down;\n\nH He Li Be B C N O F Ne Na, Mg Al Si P S CL Ar K Ca\n\nThen put it into the table\n\nH\nHe\nLi Be B C N O F Ne\nNa Mg Al Si P S Cl Ar \nK Ca\n\nYou will need to line them up because Yahoo has left align, but the trick is the story. \n\nThe groups 1-8 tell you how many electrons are in the outer shell, the periods tell you how many shells etc\n\nHope this helps!
778176
Use the periodic table of the elements.  The "weights" are in grams per mol.  Just use algebra and solve for the number of mols.  Then you know how many atoms there are by the number of mols which is a definite number.
227636
This guy:\n\nhttp://www.theodoregray.com/PeriodicTable/\n\nhas some great pictures of samples of elements.
198620
My Chemistry teacher taught me a great story which helped me learn the elements, which groups they were in, which periods, how many electrons they had etc and resulted in me going from a grade F to B. Every kid should learn this.\n\nHorrible Heary Little Begger Boys Catch Newts On Friday Near Naples, Magnificent Albert Sits Planning Some Clever Arrangement Keeping Calm.\n\nOk, looks crazy until you break it down;\n\nH He Li Be B C N O F Ne Na, Mg Al Si P S CL Ar K Ca\n\nThen put it into the table\n\nH\n                   He\nLi Be  B C  N O F  Ne\nNa Mg Al Si P S Cl Ar \nK  Ca\n\nYou will need to line them up because Yahoo has left align, but the trick is the story. Hope this helps
235740
Use toothpicks and colored gumdrops.\n\nChoose a color for: protons, neutrons, and electrons.\n\nThen use the colored gumdrops to represent them. for example, use 2 blue gumdrops for the protons, 2 red gumdrops for the electrons.\n\nthen connect them using the toothpicks- so end result is it looks lke an atom with te protons in the middle (nucleus) and electrons on the outside.
660043
1.) do your own homework\n2.) this is the computer forum, not high-school chemistry.  Next time post to the right furom.
488112
http://chemistry.allinfoabout.com/features/nonmetals.html
131141
Please edit your question to say what element you mean.  Same for the other one a few minutes earlier.
764097
Find the atomic number of elements.\n\nFind other data about the elements (molar mass, electronegativity, etc).\n\nPredict the properties of elements based on know properties of other elements in the same column or row.\n\nPredict the properties that have not been discovered yet.
740889
repetition is key. make notecards and carry them with you. study with other people and take turn asking questions.
107958
study a little bit each day.  If your exam is tomorrow, try studying the things you think are 1) hardest 2) most likely to be on the test
754664
Los Alamos national lab has a good periodic table/ elemental factoids.\n\nLanthanum is La.  It is the beginning of the "Lanthanides".
1178377
I will recommend you to use spark notes. They are short, concise, and easy to understand difficult topics in a hurry.\n \nGo to Barnes & Nobles en get the CHEMISTRY SPARK CHARTS. It has a section with five easy to follow steps to do electronic configuration. I wish I could number them here, but the copyright law is severe. \n\nIn the meantime, here is an easy and short way to electronic configuration.\n\nI hope these links provide the help you are looking for. Good luck in your test :)
253451
http://www.chemicalelements.com/\n this is an interactive site that allows you to look us any of the elements and get information about each
1137363
Each group in the periodic table has a characteristic valency (or set of valencies).  This is what you learn.  Look through your text for the valencies of atoms in compounds to give you a feeling for the elements that can have several valencies (like the transition metals).