The screening effect of 'd' electrons is:

1. Much less than s-electrons.

2. Much more than s-electrons.

3. Equal to s-electrons.

4. Equal to p-electrons.

Subtopic:  Screening Effect |
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Correct statement regarding transuranic elements is :

1. They have higher atomic number than uranium.

2. They are lighter than uranium.

3. They have lower atomic number than uranium.

4. They have same atomic number as uranium.

Subtopic:  Modern Periodic Table & Periodicity |
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The correct  sequence of increasing order of density is:

1. Li < K< Na < Rb < Cs

2. Li < Na < K < Rb < Cs

3. Cs < Rb < K < Na < Li

4. K < Li < Na < Rb < Cs

Subtopic:  Atomic Size |
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General electronic configuration of outermost and penultimate shell of an atom is
(- 1)s2 (n - 1) p6 (- 1)dx ns2. If n = 4 and x = 5, the number of proton in the nucleus is:

1. > 25

2. < 24

3. 25

4. 30

Subtopic:  Electronic Configuration |
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The maximum number of valence electrons possible for atoms in the second period of the periodic table is:

1. 18

2. 10

3. 8

4. 2

Subtopic:  Electronic Configuration |
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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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