Arrangement of the periodic table according to the highest-energy sublevel occup

Question

Arrangement of the periodic table according to the highest-energy sublevel occupied in the ground state. If you picture this page when you look at the periodic table, you can use the periodic table to visualize the valence electron configurations. Also remember that for a main-group element, the number of valence electrons is equal to the group number. Remember that: . an s orbital holds two electrons (groups 1A - 2A) a set of p orbitals holds 6 electrons (groups 3A-8A) a set of d orbitals holds 10 electrons (groups 3B-8B, 1B-2B) - a set of f orbitals holds 14 electrons (the lanthanides and actinides) IA Group 8A 3A 4A 5A 6A 7A s 6 2A 2 1 2s2 3B 4B 5B 6B 7B 8B 8B 8B IB 2B Period 44s 1 10 4f

Explanation / Answer

For a givrn valence electron configuration, the shell number represents period and number of valence electrons represent its group.

For exampl, for an element with valence electron configuration of nsk, n= period and k= group.

If k=1,2,3 then the group is 1, 2, 3 respectively.But if k=4,5,6,7,8 then group is (10+k).

(1) The element with a valence electron configuration of 3s1 is in group 1st and period 3rd.

(2) The element with a valence electron configuration of 2s2 2p2 is in group 4th and period 2nd.

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