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GROUPA:A.1s²2s²B.1S²2S²2P⁶3S² C.1s²2s²2p63s²3p³ D.1s²2s²2p⁶GROUPB:1. Which are the elements coming with in the same period2. Which are the ones coming with in the same group?3. Which are the noble gas elements.4. To which group and period does the elements ‘C ‘belongmatch the two groups:

Answer»

B,C belong to same period as they are having same VALENCE SHELL configuration

A,B belong to same GROUP as the value of "n" is same

D is a NOBLE gas ELEMENT as it has octet configuration

3-period, 5-group n=3,valence electrons=5




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