Asked by J.Nandhini
how to draw atomic structure for elements from scandium to zinc ?and what is their valency number.plz show me the shell structure.
Answers
Answered by
DrBob222
Through element #20 (Ca), it is
1s2 2s2 2p6 3s2 3p6 4s2.
For elements 21 through 30 (Sc through Zn) you fill the d orbitals. The way to remember how many d electrons (there are two exceptions) is it's the second number of the atomic number. That is Sc has 21 (from the 1 in 21), Ti has 22, V has 23 etc. The two exceptions are Cr and Cu.Cr,#24,--instead of [Ne]3d4 4s2 it is [Ne] 3d5 4s1--that is the d and s orbitals are BOTH half filled). The same kind of thing happens at Cu, #29. Instead of [Ne]3d9 4s2 it is 3d10 4s1. I call this the DrBob rule.
1s2 2s2 2p6 3s2 3p6 4s2.
For elements 21 through 30 (Sc through Zn) you fill the d orbitals. The way to remember how many d electrons (there are two exceptions) is it's the second number of the atomic number. That is Sc has 21 (from the 1 in 21), Ti has 22, V has 23 etc. The two exceptions are Cr and Cu.Cr,#24,--instead of [Ne]3d4 4s2 it is [Ne] 3d5 4s1--that is the d and s orbitals are BOTH half filled). The same kind of thing happens at Cu, #29. Instead of [Ne]3d9 4s2 it is 3d10 4s1. I call this the DrBob rule.
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