Why do you think some of the blocks on the periodic table are longer than others? (why is the d-block longer than the s-block?
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Explanation:-
The period to which a given element belongs can easily be determined from its electron configuration. ... Based on electron configurations, the periodic table can be divided into blocks denoting which sublevel is in the process of being filled. The s, p, d, and f blocks are illustrated below.
0crimsonswarm0:
I'm confused
s block: first 2 columns on the left hand side of the Periodic Table. d block: 10 columns in the middle of the Periodic Table. p block: last 6 columns on the right hand side of the Periodic Table. f block: bottom 2 rows separated from the rest of the Periodic Table.
When n = 4, we find that in the orbitals 3d, 4s and 3p which are present in the outermost shells have energies in increasing order — i.e. 3p<4s<3d. ... So, maximum number of electrons found in the three orbitals is 9X2 = 18. Therefore, 4th period should have 18 elements.
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