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Answer the following questions: Due to...

Answer the following questions:
Due to uncertainity in the names of some of the elements, a question mark is indicated before the symbol in the Mendeleev's period table. What are such symbols?

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NAVNEET PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-EXERCISE
  1. Answer the following questions: Name the elements, group , formulae ...

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  2. Answer the following questions: There are some vacant places in the ...

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  3. Answer the following questions: Due to uncertainity in the names of ...

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  4. Chlorine has two isotopes, viz. Cl-35 and Cl-37 Their atomic masses ar...

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  5. How is the problem regarding the position of cobalt("59CO) and nickel ...

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  6. Answer the following questions: How did the position of get fixed t...

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  7. Answer the following questions: Can there be an element with atomic ...

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  8. Answer the following questions: What do you think? Should hydrogen be...

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  9. Answer the following questions: The elements in the second period :Li...

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  10. Answer the following questions: The elements in the third period , n...

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  11. What is the relationship between the electronic configuration of an el...

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  12. The atomic number of beryllium is 4 while that of oxygen is 8. Write d...

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  13. What is the periodic trend in the variation of valency while going fro...

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  14. Answer the following questions: Considering the elements of period 3...

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  15. Answer the following questions: Considering the elements of period 3...

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  16. Answer the following questions: Considering the elements of period 3 ...

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  17. Answer the following questions: What is the periodic trend in the va...

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  18. Classify the elements of the third period into metals and non-metals.

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  19. Answer the following questions: On which side of the period are the m...

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  20. On which side of the period did you find the Non-metals?

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