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 |
 88%
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The element with atomic number 26 is:

1. A non-metal

2. Krypton

3. Iron

4. Manganese

 

Subtopic:  Modern Periodic Table & Periodicity |
 88%
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The alkali metals have:

1. highest ionization energy

2. largest atomic radii

3. highest density

4. highest electronegativity

Subtopic:  Modern Periodic Table & Periodicity |
 73%
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The telluric helix was given by:

1. Newland

2. Mendeleev

3. Lothar Meyer

4. De-chancourtois

Subtopic:   Evolution of Periodic Table |
 64%
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The element with atomic number 30 is expected to be present in:

1. IB group

2. IA group

3. IIA group

4. IIB group 

Subtopic:  Electronic Configuration |
 75%
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The correct order of acid strength is:

1. Cl2O7>SO2>P4O10

2. CO2>N2O5>SO3

3. Na2O>MgO>Al2O3

4. K2O>CaO>MgO

Subtopic:  Nature of Compound |
 79%
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Which among the following elements is the bridge element?

1. K

2. O

3. Mg

4. Pb

Subtopic:  Modern Periodic Table & Periodicity |
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