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6. Observe the table and answer the following questions. Electronic configuration 1s² 2s² a) b) Element A B C D 1s² 2s²2p6 3s² 1s² 2s²2p6 3s² 3p³ 1s² 2s²2p6 Which are the elements coming within the period? Which are the elements coming within the same group?​