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The atom of an element has 9 protons , 9...

The atom of an element has 9 protons , 9 electrons and 10 neutorns.
(i) What is the atomic number of the element?
(ii) what is the mass number of the element?
(iii) Name the element and gives its electronic configuration
(iv) Predict the valenecy of the element.

Text Solution

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(i) The atomic no of element = No of protons =9
(ii) The mass no of element = No of protons + No of neutrons
=9+10=19
(iii) The element with Z=9 is fluorine (f)
Its electonic configuration =2,7
(iv) The valency of fluorine is 1 and is calculated as 8-7=1
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