a. 1s^2  b. 1s^22s^22p^6 In which group and period of the periodic table they are placed?

a. 1s^2  b. 1s^22s^22p^6 In which group and period of the periodic table they are placed?
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The electronic configuration of some elements are given below : a. 1s2 b. 1s22s22p6 In ... and period of the periodic table they are placed?
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