Consider the following ground state electron configurations.  i. 1s2 2s2 2p6 3s2  ii. 1s2 2s2 2p6  iii. 1s2 2s2 2p6 3s1  iv. 1s2 2s2 2p6 3s2 3p6 4s2 3d1  v. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6  which electron configurations represent elements in the same group of the periodic table?  (a) II and V  (b) I and IV  (c) III and IV  (d) I and III

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