The electronic configuration of the element which is just above the element with atomic number 43 in the same group is ______.

1. 1s22s22p63s23p63d54s2

2. 1s22s22p63s23p63d54s34p6

3. 1s22s22p63s23p63d64s2

4. 1s22s22p63s23p63d74s2

Subtopic:  AUFBAU Principle |
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Comprehension given below is followed by some multiple choice questions. Each question has one correct option. Choose the correct option.

In the modern periodic table, elements are arranged in order of configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four block, viz s, p, d and f.

The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. In accordance with the Aufbau principle, the seven periods (1 to 7) have 2, 8, 8, 18, 18, 32 and 32 elements respectively.

The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthanoids and actinoids are placed at the bottom of the periodic table

(i) The element with atomic number 57 belongs to 

1. s-block

2. p-block 

3. d-block

4. f-block

Subtopic:  AUFBAU Principle |
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The statement that is not correct for periodic classification of elements is:

1. The properties of elements are periodic function of their atomic numbers
2. Non-metallic elements are less in number than metallic elements
3. For transition elements, the 3d-orbitals are filled with electrons after 3p-orbitals and before 4s-orbitals
4. The first ionisation enthalpies of elements generally increase with increase in atomic number as we go along a period

Subtopic:  AUFBAU Principle |
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Assertion (A): It is impossible to determine the exact position and exact momentum of an electron simultaneously.
Reason (R): The path of an electron in an atom is clearly defined. 

1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. (A) is False but (R) is True.
Subtopic:  Heisenberg Uncertainty Principle |
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Assertion (A): A black body is an ideal body that emits and absorbs radiation of all frequencies.
Reason (R): The frequency of radiation emitted by a body goes from lower frequency to a higher frequency with an increase in temperature.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

Subtopic:  Planck's Theory |
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Assertion (A): All isotopes of a given element show the same type of chemical behaviour.
Reason (R): The chemical properties of an atom are controlled by the number of electrons in the atom.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

Subtopic:  Number of Electron, Proton & Neutron |
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Match species are given in Column I with the electronic configuration given in Column II.

Column I

Column II

A. Cr

1. [Ar]3d84s0

B. Fe2+

2. [Ar]3d104s1

C. Ni2+

3. [Ar]3d64s0

D. Cu

4. [Ar]3d54s1

5. [Ar]3d64s2

Codes

Options:  A   B   C   D 
1.  4  3  1  2
2.  1  2  3  5
3.  5  4  3  2
4.  4  5  3  2

Subtopic:  Pauli's Exclusion Principle & Hund's Rule |
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Match the following.

Column I

Column II

A. Photon

1. Value is 4 for N-shell

B. Electron

2. Probability density

C. ψ2

3. Always positive value

D. Principle quantum number n

4. Exhibits both momentum and wavelength

Options:   A   B   C   D 
1.  4 4  2,3   1,3 
2.  1 2  3  4
3.  2,1  4  3  2,3
4.  4 5  3  2


 

 

Subtopic:  Quantum Numbers & Schrodinger Wave Equation |
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Match the following:

Column I Column II
A. X-rays 1. v=100-104 Hz
B. Ultraviolet wave (UV) 2. v=1010 Hz
C. Long radio waves 3. v=1016 Hz
D. Microwave 4. v=1018 Hz
 
A B C D
1. 4 1 3 2
2. 1 4 2 3
3. 1 4 3 2
4. 4 3 1 2
Subtopic:  Electromagnetic Radiation |
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Match the ensuing rules with the corresponding statements:

Rules Statements
A. Hund’s Rule 1. No two electrons in an atom can have the same set of four quantum numbers.
B. Aufbau Principle 2. Half-filled and completely filled orbitals have extra stability.
C. Pauli's Exclusion Principle 3. Pairing of electrons in the orbitals belonging to the same subshell does not take place until each orbital is singly occupied.
D. Heisenberg’s Uncertainty Principle 4. It is impossible to determine the exact position and exact momentum of a subatomic particle simultaneously.
5. In the ground state of atoms, orbitals are filled in the order of their increasing energies.
 
A B C D
1. 3 5 1 2
2. 1 2 3 4
3. 3 5 1 4
4. 4 5 3 2
Subtopic:  Pauli's Exclusion Principle & Hund's Rule |
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