how to find valency of an element
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Answers:S has 2 valencies for the reaction with Oxygen: 4 and 6. for the other elements, it depends on the number of electrons on their last layer... for example: Na(sodium) has the number of protons equal with 11 which means the number of electrons is equal with 11. which means layer 1 has 2 electrons, layer 2 has 8 electrons,and the last layer has the last electron ... which gives sodium the valence 1 S has valency 6 and requires 3 atoms of oxygen to result a SO3, and valency 4 because it needs 4 atoms of oxygen to result SO4 and S also has valency 2 for the reaction with metals.
Answers:take the electronic configuration of chlorine...its easy....if the atomic number of Cl is 17 then the electronic configuration of Cl is 2,8,7....so the valency of chlorine is 1...coz chlorine needs 1 eletron to fulfil its octate structure.....so the valency of Cl is 1
Answers:I don't know the answer to your first question because that confuses me too. But I think I can answer your second question. I think that you can't draw a Lewis structure for something like XeF2 because noble gases are inert; they do not readily react with other elements and thus can't bond. Correct me if I'm wrong but I hope I helped a little bit!
Answers:I will give you a link to a periodic table that will help with "valencies" called oxidation states. Just click on the element and page down the window that comes up. The information will appear under the heading of oxidation states. Happy reading. :)