English, 17.10.2021 14:00 edwardo9

6. The following are compounds except A. phosphorus B. sodium chloride 7. Which chemical symbol stands for silver? C. calcium oxide D. sugar A. Mg D. Au
8. Which element has a chemical symbol of Na? A. potassium C. sodium B. neon D. nickel
9. Which of the following is not correct? A. I- iron C. Ne-neon B. Mg- magnesiun D. F- fluorine
10. Elements are named after the given choices except A. discoverer or scientist B. place where they are discovered C. abundant source or mineral D. size and texture
11. How many element have been named and identified? A. 92 B.103 C.118 D.114
12. Who introduced the chemical symbols for elements? A. J. Dalton C. J. J. Berzelius B. E. Rutherford D. D. Mendeleev
13. Which does not become a basis for naming of elements? A. name of a scientist C. name of a place B. name of a mineral D. name of an organization 14. Which does not belong to the given elements? A. Sodium-Na C. Silver-Ag B. Manganese-Mn D. Lead-Pb
15. Which element is named after a scientist? A. hydrogen B. gold B. gold C. curium D. mercury

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6. The following are compounds except A. phosphorus B. sodium chloride 7. Which chemical symbol st...

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