Chemistry
Elements X, Y, Z have atomic numbers 6, 9 and 12 respectively. Which one :
(i) forms anion – negative ion;
(ii) forms cation – positive ion;
(iii) has 4 electrons in the outermost orbit.
Atomic Structure
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Answer
X[6] = Electronic configuration [2,4]
Y[9] = Electronic configuration [2,7]
Z[12] = Electronic configuration [2,8,2]
(i) Y gains one electron to attain a stable octet, hence becomes negatively charged anion.
(ii) Z loses two electrons to attain a stable octet hence becomes positively charged cation.
(iii) X has 4 electrons in the outer most shell.
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