Q2 of 45 Page 544

Name the elements which has:

(i) a total of three shells with three electron in its valence shells.


(ii) Half as many electronic in its third shell as in its second shell.

(i) The element which has a three shell and three electrons in the outermost shell is Aluminium(Al)


The atomic number of Al is 13 which can be written as electronic configuration 2, 8, 3.


(ii) The second shell, l shell can have a maximum of 8 electrons. The third shell will have 4 electrons.


The required compound is Silicon(Si)-14


The electronic configuration of silicon is 2, 8, 4


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