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 |
 62%
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Which one is a metalloid?

1. Tin

2. Germanium

3. Sulphur

4. Carbon

Subtopic:  Nature of Compound |
 82%
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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) |
 80%
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Elements with an electronic configuration 1s2s22p 3s23p63d10 4s24p64d10 5s25p3 belong to the group :

1. 3rd 2. 15th
3. 17th 4. 2nd
Subtopic:  Electronic Configuration |
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Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?

1. 3d3,4s2

2. 3d5,4s1

3. 3d5,4s2

4. 3d2,4s2

Subtopic:  Electronic Configuration |
 61%
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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

Subtopic:   Evolution of Periodic Table |
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 All the non-metals in the long form of the periodic table are placed under:

1. s-Block

2. p-Block

3. f-Block

4. d-Block

Subtopic:  Modern Periodic Table & Periodicity |
 88%
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General electronic configuration of the transition elements is given by:

1. ns2nd1-10

2. ns2np6nd1-10

3. (n-1)d1-10np6

4. (n-1)d1-10ns1-2

 

Subtopic:  Electronic Configuration |
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