Q24 of 203 Page 129

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

To see atoms of different elements a special type of microscope called Scanning Tunnelling microscope [STM] is used. It is an electron microscope for imaging surfaces at the atomic level. It produces 3D images of the sample.


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22

Give one major drawback of Dalton’s atomic theory of matter.

 23

Dalton’s atomic theory says that atoms are indivisible. Is this statement still valid? Give reasons for your answer.

 25

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

 26

Give two symbols which have been derived from the “Latin names” of the elements.