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 |
 83%
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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 |
 64%
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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 |
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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 |
 82%
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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.
Subtopic:  Electronic Configuration |
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The ions O2-, F-, Na+, Mg2+, and Al3+ are isoelectronic. Their ionic radii show [2003]

1. an increase from O2- to F- and then decrease from Na+ to Al3+

2. a decrease from O2- to F- and then increase from Na+ to Al3+

3. a significant increase from O2- to Al3+

4. a significant decrease from O2- to Al3+

Subtopic:  Electronic Configuration |
 70%
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An example of metalloid elements in the periodic table is:

1. Na and K 2. Cu and Al
3. As and Si 4. Ca and Mg
Subtopic:  Modern Periodic Table & Periodicity |
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