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Elements upto atomic number 103 have been synthesized and studied. If a newly discovered element is found to have an atomic number 106, its electronic configuration will be -
1. [Rn] 5f¹⁴, 6d⁴, 7s²
2. [Rn] 5f¹⁴, 6d¹, 7s² 7p³
3. [Rn] 5f¹⁴, 6d, 7s⁰
4. [Rn] 5f¹⁴, 6d⁵, 7s¹

Which of the following order is not in accordance with the property stated against it?                                                                                                      
1. F₂ > Cl₂ > Br₂ > l₂ Oxidising Power
2. Hl > HBr >HCl >HF Acidic property in water
3. F₂ > Cl₂ > Br₂ > l₂ Electronegativity
4. F₂ > Cl₂ > Br₂ > l₂ Bond dissociation energy

The most non-metallic element among the following is:
1. Be
2. B
3. Mg
4. Al

₅₈Ce is a member of which block?
1. s-block elements.
2. p-block elements.
3. d-block elements.
4. f-block elements.

The screening effect of 'd' electrons is:
1. Much less than s-electrons.
2. Much more than s-electrons.
3. Equal to s-electrons.
4. Equal to p-electrons.

The correct  sequence of increasing order of density is:
1. Li < K< Na < Rb < Cs
2. Li < Na < K < Rb < Cs
3. Cs < Rb < K < Na < Li
4. K < Li < Na < Rb < Cs

The maximum number of valence electrons possible for atoms in the second period of the periodic table is:
1. 18
2. 10
3. 8
4. 2

The electronic configuration that represents the d-block element is: 
1. 1s² 2s² 2p⁶ 3s²3p⁶3d¹⁰ 4s²4p⁶
2. 1s² 2s² 2p⁶ 3s²3p⁶3d¹⁰ 4s²4p¹
3. 1s² 2s² 2p⁶ 3s²3p⁶3d¹⁰ 4s²
4. 1s² 2s² $2p^6$ 3s²3p⁶ 4s²

The most common oxidation state of cerium (Ce) is:
1. +5, +3
2. +5, +4
3. +3, +4
4. +3, +5

Amongst the following electronic configurations, the highest ionization energy
is represented by:
1. [Ne]3s²3p³
2. [Ne]3s²3p²
3. [Ar]3d¹⁰4s²4p³
4. [Ne]3s²3p¹

Lanthanoid contraction is caused due to :
1. the appreciable shielding on outer electrons by 4f electrons from the nuclear charge
2. the appreciable shielding on outer electrons by 5d electrons from the nuclear charge
3. the same effective nuclear charge from Ce to Lu
4. the imperfect shielding on outer electrons by 4f electrons from the nuclear charge

The outer electronic configuration of Gd (Atomic no. 64) is:
1. 4f³ 5d⁵6d²
2. 4f⁸ 5d¹⁰6d²
3. 4f⁴ 5d⁴6d²
4. 4f⁷ 5d¹6s²

The radius of La³⁺ (at. no. 57) is 1.06 $\stackrel{°}{\mathrm{A}}$ The radius of Lu³⁺ (at.no. 71) might be:
1. 1.06  $\stackrel{°}{\mathrm{A}}$
2. 0.85  $\stackrel{°}{\mathrm{A}}$
3. 1.60  $\stackrel{°}{\mathrm{A}}$
4. 1.40  $\stackrel{°}{\mathrm{A}}$

Ionic radii are :
1. Inversely proportional to the effective nuclear charge.
2. Inversely proportional to the square of effective nuclear charge.
3. Directly proportional to the effective nuclear charge.
4. Directly proportional to the square of effective nuclear charge.

Which one of the following has the highest melting point?
1. Na
2. Mg
3. K
4. Al

Those in a group that falls under the law of triads include:
1. Cl, Br, I
2. C, N, O
3. Na, K, Rb
4. H, O, N

The statement that is incorrect for the periodic classification of elements is:
1. The properties of elements are a periodic function of their atomic number.
2. Non-metallic elements are lesser in number than metallic elements.
3. The first ionization energies of elements along a period do not vary in a regular manner with an increase in atomic number.
4. For transition elements, the d-subshells are filled with electrons monotonically with an increase in atomic number.

The ions O^2-, F^-, Na⁺, Mg^2+, and Al³⁺ are isoelectronic. Their ionic radii show [2003]
1. an increase from O^2- to F^- and then decrease from Na⁺ to Al³⁺
2. a decrease from O^2- to F^- and then increase from Na⁺ to Al³⁺
3. a significant increase from O^2- to Al³⁺
4. a significant decrease from O^2- to Al³⁺

The alkali metals have:
1. highest ionization energy
2. largest atomic radii
3. highest density
4. highest electronegativity

The telluric helix was given by:
1. Newland
2. Mendeleev
3. Lothar Meyer
4. De-chancourtois