The electronic configuration of four elements A,B,C and D,is given as follows: A- 2,8. B – 2,8,1. C – 2,8,2. D – 2,8,8. (a)Which of them belong to the same period? Name the period. (b)Which of them belong to the same group? Name the group. (c) Which amongst them would form (i) monovalent cation (ii) divalent cation.
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Answer:
The atomic number of a is 2+8+2=12. Hence the element is Mg. The atomic number of a is 2+8+8=18. Hence the element is Ar.
Answer:
[a] B,C and D belongs tgo same period as they have same no. of shells
[b]A and D belongs to same group as the have same number of valance electron in their valence shell
[c] i B will form monovalent cation by losing one electron.
ii C will form divalent cation by losing two electrons.
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Explanation: