Exercise 3 B- Calcium Ca th belongs to the 4" period and is found just below Mg(Z= 12). 1- Find the atomic number of Ca. 2- Calculate its number of neutrons, knowing that it contains 40 nucleons.

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A: Fig-Structure of Oxygen and symbolic representation 168O8

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Q: correct

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Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.