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State whether the following statement is...

State whether the following statement is true or false :
The symbol of element cobalt is `CO`.

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LAKHMIR SINGH & MANJIT KAUR-ATOMS AND MOLECULES-Exercise
  1. Write the relation between nanometre and metre.

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  2. The radius of an oxygen atom is 0.073 nm. What does the symbol 'nm' ...

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  3. State whether the following statement is true or false : The symbol...

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  4. Define 'molecular mass' of a substance.

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  5. What is meant by saying that 'the molecular mass of oxygen is 32'...

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  6. Fill in the following blanks with suitable words : (a) In water , t...

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  7. (a) Name the element used as a standard for atomic mass scale. (b) W...

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  8. Give one major drawback to Dalton's atomic theory of matter.

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  9. Dalton's atomic theory says that atoms are indivisible. Is this stat...

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  10. Is it possible to see atoms these days? Explain your answer.

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  11. What is meant by the symbol of an element ? Explain with example...

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  12. (a) Give two symbols which have been derived from the "English names ...

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  13. Give the names and symbols of five familiar substances which you thin...

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  14. State the chemical symbols for the following element: Sodium, Potass...

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  15. Name the element represented by the following symbols : Hg, Pb, Au, ...

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  16. What is meant by atomicity ? Explain with two examples.

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  17. What is the atomicity of the following ? (a) Oxygen , (b) Ozone , (...

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  18. What is meant by a chemical formula ? Write the folrmulae of one elem...

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  19. Write the formulae of the following compounds. Also name the element ...

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  20. Explain the difference between 2 N and N(2).

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