Which pair has elements containing a same number of electrons in the outermost orbit?

1. N, O

2. Na, Ca

3. As, Bi

4. Pb, Sb

Subtopic:  Electronic Configuration |
 80%
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The correct arrangement of increasing order of atomic radius among Na, K, Mg and Rb is 

1. Mg<K<Na<Rb

2. Mg<Na<K<Rb

3. Mg<Na<Rb<K

4. Na<K<Rb<Mg

Subtopic:  Atomic Size |
 83%
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Which of the following statement is correct with respect to the property of elements with increase in atomic number in carbon family.

1. Their metallic character decreases

2. The stability of +2 oxidation state increases

3. Their ionisation energy increases

4. Their atomic size decreases

Subtopic:  Modern Periodic Table & Periodicity |
 75%
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The correct order of second ionization potential of carbon, nitrogen, oxygen and fluorine is

1. C > N > O > F

2. O > N > F > C

3. O > F > N > C

4. F > O > N > C

Subtopic:  Ionization Energy (IE) |
 54%
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The electronic configuration of the element which is just above the element with atomic 43 in the same group is ____________.

1. 1s2s2p3s3p3d4s2

2. 1s2s2p3s3p3d5 4s3 4p6

3. 1s2s2p3s3p3d6 4s2

4. 1s2s2p3s3p3d7 4s2

Subtopic:  Electronic Configuration |
 75%
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Generally, the ionization enthalpy increases along a period but there are some exceptions. The one which is not an exception is-

1. Be and B

2. N and O

3. Mg and Al

4. Na and Mg

Subtopic:  Ionization Energy (IE) |
 65%
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Sodium generally does not show an oxidation state of +2, because of:

1. High first ionization potential.

2. High second ionization potential.

3. Large ionic radius.

4. High electronegativity.

Subtopic:  Electronic Configuration |
 78%
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The electronegativity of the following elements increases in the order of:

1. S < P < N < O 2. P < S < N < O
3. N < O < P < S 4. N < P < S < O
Subtopic:  Electronegativity |
 71%
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The graph of the first ionization enthalpy versus atomic number as follows:

Which of the following statement is correct?

1. Alkali metals are at the maxima and noble gases at the minima.

2. Noble gases are at the maxima and alkali metals at the minima.

3. Transition element are at the maxima.

4. Minima and Maxima do not show any regular behaviour.

Subtopic:  Modern Periodic Table & Periodicity |
 72%
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What is the combining ratio of a number of elements in group l with elements in group 17th of the periodic table ?

1. 1 : 2

2. 1 : 3

3. 2 : 1

4. 1 : 1

Subtopic:   Evolution of Periodic Table |
 77%
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