Name the rules that one must obey while filling electrons in various orbitals.

Rules for filling electrons in shells

Name the principle which restricts the pairing of electrons in degenerate orbitals.

Name the principle which restricts the pairing of electrons in degenerate orbitals.

Which one of the following actinoid has no electron in 6d orbital?

Name and state the principle, which restrict the maximum numbers of electrons in an orbital to be two.

Which of the following isnot correct regarding C_2 molecule? : C_2 molecule has been found to exist in vapour phase, It has a total 12 electrons, out of which 8 electrons occupy bonding orbitals while 4 electrons occupy antibonding orbitals., The molecule is paramagnetic., C_2 molecule contains double bond and both are pi bonds

In the following question, an Assertion (A) is followed by a corresponding Reason (R). Use the following keys to choose the appropriate answer. Assertion : Fluorine molecule has bond order one. Reason : The number of electrons in the antibonding molecular orbitals is two less than that in bonding molecular orbitals.

A student argued that the 3d orbitals will be filled only after the 4s orbital is completely filled in accordance with aufbau principle. Then another student opposed by saying that it is not true for certain elements like Cr and Cu. Write electronic configuration of underset(24)(Cr) and underset(29)(Cu) . Justify your answer.

Assertion : Only principal quantum number determines the energy of an electron in an orbital of Na atom. Reason : For one electron system, the expression of energy is quite different from that obtained in Bohr's theory. : If both (A) and (R) are correct and (R) is the correct explanation of(A)., If both (A) and (R) are correçt, but (R) is not the correct explanation of (A)., If (A) is correct, but (R) is incorrect., If both (A) and (R) are incorrect.