If the Aufbau principle had not been followed, Ca (Z = 20) would have been placed in the:a) s-blockb) p-blockc) d-blockd) f-blockThe correct answer is option 'C'. Can you explain this answer?

Question

Answer

Hey buddy,As you know that aufbau principle states that filling of orbitals takes place in increasing order of energy means orbitals having less energy are filled first. Now, in calcium we put the last two electrons in 4s orbital because 4s orbital has less energy than 3d orbital. Now,If there was no aufbau principle then there was no energy criteria for filling up of electrons and electrons are filled according to their number like 1s,2s,2p,3s,3p,3d,4s....and so on.And according to this order the last electron of calcium will enter the d-orbital and hence it will be placed in the d-orbital.

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Answer will be s-block.Becouse their outer most electrons enter in s-subshell.

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C

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Option c i.e d block is right bcz according to its electronic configuration its last electron goes to 4s subshell but when aufbau principle is violated its last electron goes to 3d subshell bcz the capacity of 3p is filled and 3d is prior to that of 4s avoiding its energywhich is greater than the former. so d block is right.

Answer

Ca+2 electronic configuration is 1s2 2s2 2p6 3s2 3p6 4s2. but if we not obey the aufbau rule then the last electron was not pairing in 4s orbital &move to next energy orbital
3d. so the answer is d orbital

Answer

The Aufbau principle is a fundamental principle in chemistry that states that electrons fill atomic orbitals in order of increasing energy levels. According to this principle, electrons will occupy the lowest energy level orbitals before filling higher energy level orbitals.

In the case of Ca (Z = 20), the electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2. This means that the first two electrons occupy the 1s orbital, the next two electrons occupy the 2s orbital, the next six electrons occupy the 2p orbital, the next two electrons occupy the 3s orbital, and finally, the last two electrons occupy the 4s orbital.

If the Aufbau principle is not followed, the electron configuration of Ca would be different. Electrons might fill higher energy level orbitals before filling lower energy level orbitals.

Let's consider an example where the Aufbau principle is not followed and electrons are placed in the p-block before the s-block. In this case, the electron configuration of Ca would be 1s2 2s2 2p6 3s2 3p6 4s2 3d1.

The electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d1 corresponds to the electron configuration of the element Sc (Z = 21), which is located in the d-block of the periodic table.

Therefore, if the Aufbau principle is not followed and Ca is placed in the d-block, the correct answer would be option 'C' - d-block.

Answer

Since aufbau principle states that electrons are progressively filled in order of their increasing energies so 4s is filled first having lower energy than 3d but if the rule is violated 3d would be filled first and the config would be1s2,2s2,2p6,3s2,3p6,3d2.....

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Answer

S block outer most electron in s shell

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By not  considering aufbau principle the electron should enter in 3d orbital before 4s so its configuration will be 1s(2) 2s(2) 2p(6) 3s(2) 3d(2) I.e. last electron is entering in d orbital so it would have been placed in d block.

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