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 |
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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 |
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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) |
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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 |
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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 |
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Which of the following transition metal ions has the lowest density?

1. Copper

2. Nickel

3. Scandium

4. Zinc

Subtopic:  Modern Periodic Table & Periodicity |
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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.

Subtopic:  Atomic Size |
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Which one is a metalloid?

1. Tin

2. Germanium

3. Sulphur

4. Carbon

Subtopic:  Nature of Compound |
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Zn and Cd do not show variable valency like 'd' block elements due to :

1. Softness

2. Completed 'd' orbital

3. Two electrons in outermost orbit

4. Low m.p.

Subtopic:  Modern Periodic Table & Periodicity |
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In the long form of periodic table, the elements having lowest ionization potential are placed in:

1. I group

2. IV group

3. VII group

4. Zero group

Subtopic:  Ionization Energy (IE) |
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