The element having atomic number 19, is:

1. an inert gas

2. a metal with oxidation number +1

3. a non-metal with oxidation number -3

4. a metal with oxidation number -3

Subtopic:  Electronic Configuration |
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Which of the following has the least density?

1. Na

2. Li

3. Mg

4. K

Subtopic:  Modern Periodic Table & Periodicity |
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Eka aluminium and Eka silicon are now known as:

1. Ga and Ge

2. Al and Si

3. Fe and S

4. H+ and Si

Subtopic:  Modern Periodic Table & Periodicity |
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An element having the electronic configuration of its atom ns2 np2 should have similar properties to those of:

1. Sodium

2. Carbon

3. Magnesium

4. Oxygen

Subtopic:  Electronic Configuration |
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The order of basic character of given oxides is:

1. Na2O > MgO > Al2O3 > CuO

2. MgO > Al2O3 > CuO > Na2O

3. Al2O3 > MgO > CuO > Na2O

4. CuO > Na2O > MgO > Al2O3

Subtopic:  Nature of Compound |
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A variable oxidation state is shown by which of the following?

1. Na

2. Cu

3. Mg

4. Al

Subtopic:  Modern Periodic Table & Periodicity |
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The lightest metal in the periodic table is:

1. H

2. Mg

3. Ca

4. Li

Subtopic:  Modern Periodic Table & Periodicity |
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Which of the following electronic configurations represents the d-block element? 

1. 1s2 2s2 2p6 3s23p63d10 4s24p6

2. 1s2 2s2 2p6 3s23p63d10 4s24p1

3. 1s2 2s2 2p6 3s23p63d10 4s2

4. 1s2 2s2 2p6 3s23p6 4s2

Subtopic:  Electronic Configuration |
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The most common oxidation state of cerium (Ce) is:

1. +5, +3

2. +5, +4

3. +3, +4

4. +3, +5

Subtopic:  Electronic Configuration |
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Which of the electronic configuration of an atom has the lowest ionization enthalpy? 

1. 1s2,2s22p5

2. 1s2,2s22p3

3. 1s2,2s22p6,3s1

4. 1s2,2s22p6

Subtopic:  Ionization Energy (IE) |
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