The atomic numbers of elements A B C D E ARE 7 10 12 4 9 RESPECTIVELY WHICH ELEMENT BELONGS TO THIRD PERIOD OF PERIODIC TABLE
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Answer:
Element With atomic number 12/ Element C.
Explanation:
Do Electronic configuration of each element:
Element Number-K-L-M-N
7 - 2-5
10- 2-8
12 - 2-8-2
4 - 2-2
9 - 2-7
As you can see the element with atomic no. 12 has electronic configuration of 3 shells. It means it belongs to period 3rd. On other hand Element with 7 have 2 Shells meaning that it belongs to period 2.
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