Q15 of 203 Page 128

The radius of an oxygen atom is 0.073 nm. What does the symbol ‘nm’ represent?

The symbol ‘nm’ represents Nanometre. A nanometer is one billionth part of metre. 1 metre = 1/109 nanometres or 1nm = 10_9m).


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13

Name the unit in which the radius of an atom is usually expressed.

 14

Write the relation between nanometer and metre.

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Why is it not possible to see an atom even with the most powerful microscope?

 17

State whether the following statement is true or false:

The symbol of element cobalt is CO.