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1. Who worked on the periodic table before Mendeleev and which elements did he predict would exist?

2. What is Fluoride

3. Sugar dissolves in water to form sugar solution. What happens to the particles? Also, why doesn't marble chips dissolve in water?

4. Hi, please can you tell me some key factors on why the periodic table is so useful to scientists. Thanks

5. What are the following elements, compounds or mixtures? Pure distilled water, Salt, Iron sulphide, Brass (alloy), Ink, Crude Oil, Copper Sulphate solution? Please help!

6. What are the following elements, compounds or mixtures? Pure distilled water, Salt, Iron sulphide, Brass (alloy), Ink, Crude Oil, Copper Sulphate solution? Please help!

7. What are the following elements, compounds or mixtures? Pure distilled water, Salt, Iron sulphide, Brass (alloy), Ink, Crude Oil, Copper Sulphate solution? Please help!

8. Which metal is actually more reactive, calcium or magnesium. And which is more reactive between lithium and potassium Thank You!

9. Which metal is actually more reactive, calcium or magnesium. And which is more reactive between lithium and potassium Thank You!

10. Is a crystal of Iodine a metal or non-metal? How do we know this? thanks !!

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