Which pair of elements is chemically most similar?

1. Na, Al

2. Cu, S

3. Ti, Zr

4. Zr, Hf

Subtopic:  Nature of Compound |
 73%
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In the transition elements, the incoming electron occupies (n-1)d sublevel in preference to:

1. np

2. ns

3. (n-1)d

4. (n+1)s

Subtopic:  Electronic Configuration |
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The electronegativity of elements from group 1 to group 17 :

1. Decreases

2. Increases

3. Remains constant

4. All of the above

Subtopic:  Screening Effect |
 84%
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The electronic configuration of the most electropositive element is :

1. [He]2s1

2. [Xe]6s1

3. [He]2s2

4. [Xe]6s2

Subtopic:  Modern Periodic Table & Periodicity | Electronic Configuration |
 58%
From NCERT
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Which one of the following is an amphoteric oxide?

1. SO2

2. B2O3

3. ZnO

4. Na2O

Subtopic:  Nature of Compound |
 58%
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Transition elements exhibit variable oxidation states because they release electrons from the following orbits:

1. ns and np orbits

2. (n-1)d and ns orbits

3. (n-1)d orbits

4. ns orbits

 

Subtopic:  Modern Periodic Table & Periodicity |
 73%
From NCERT
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Elements of group IB  is called as:

1. Normal elements. 2. Transition elements.
3. Alkaline earth metals. 4. Alkali metals.
Subtopic:  Modern Periodic Table & Periodicity |
 62%
From NCERT
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Element that has the greatest tendency to lose an electron is :

1. F 2. Fr
3. S 4. Be
Subtopic:  Ionization Energy (IE) |
 62%
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The outer electronic configuration of Gd (Atomic no. 64) is:

1. 4f3 5d56d2

2. 4f8 5d106d2

3. 4f4 5d46d2

4. 4f7 5d16s2

Subtopic:  Atomic Size |
 79%
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The radius of La3+ (at. no. 57) is 1.06 A° The radius of Lu3+ (at.no. 71) might be:

1. 1.06  A°

2. 0.85  A°

3. 1.60  A°

4. 1.40  A°

Subtopic:  Atomic Size |
 65%
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