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Quantum Numbers

The of an ato...

Question

The __________ of an atom is the representation of the arrangement of electrons distributed among the orbital shells and subshells.

A

electron configuration

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B

electric configuration

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C

neutron configuration

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D

proton configuration

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Solution

The correct option is A electron configuration
Electronic configuration of an atom is the representation of arrangement of electrons in the shell, sub-shell and orbitals in an atom.

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Q. The ratio of atomic numbers of two elements A and B is 1 : 2. The number of electrons present in the valence shell (3rd) of A is equal to the difference in the number of electrons present in the other two shells. Steps involved in the calculation of ratio of number of electrons present in a penultimate shell to antepenultimate shell of B are given below. Arrange them in the correct sequence.
(a) Calculation of atomic number of B.
(b) Calculation of valence electrons present in A.
(c) Calculation of atomic number of A.
(d) Calculation of number of electrons present in the penultimate shell and antepenultimate shell of B.
(e) Writing electronic configuration of B.

Q. Identify the correct statements among the following:
(A) All orbitals in a shell are degenerate.
(B) Electron configuration of chromium violates Aufbau principle.
(C) Maximum number of unpaired electrons in 'f' subshell is 7.
(D) Maximum number of unpaired electrons in a subshell is 4

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Q. The valence electronic configuration of an atom is

6 s^{2}

. If d orbital of the penultimate shell contains two unpaired electrons, calculate the atomic number

Q. Two electronic configuration of an element 'A' are given below.
(Symbols not real)

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{1}

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1}

(a) Identify the correct electronic configuration.
(b) Write the period in which the element is present in the periodic table.
(c) Consider another element 'C' with sub-shell configuration

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}

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Q. The order of screening effect of electrons of

s, p, d

f

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