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The first ionization potential of Be and B will be:

1.  8.8 and 8.8
2.  6.6 and 6.6
3.  6.6 and 8.8
4.  8.8. and 6.6

Subtopic:  Ionization Energy (IE) |
 81%
Level 1: 80%+
AIPMT - 1998
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An electronic configuration that has maximum difference between II and III ionization potential is:

1. 1s2 2s2 2p6 3s1

2. 1s2 2s2 2p6 3s2

3. 1s2 2s2 2p6

4. 1s2 2s2 2p5

Subtopic:  Ionization Energy (IE) |
 70%
Level 2: 60%+
AIPMT - 1999
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Incorrect order among the following is:

1. NH3 < PH3 < AsH3 – Acidic
2. Li < Be < B < C – Ist Ionization potential
3. Al2O3 < MgO < Na2O < K2O - Basic
4. Li+ < Na+ < K+ < Cs+ - Ionic radius
Subtopic:  Ionization Energy (IE) | Atomic Size |
 78%
Level 2: 60%+
AIPMT - 2002
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If an atom has electronic configuration 1s22s22p63s23p63d34s2, we will place it in group number:

1. Fifth 2. Fifteenth
3. Second 4. Third
Subtopic:  Electronic Configuration |
 70%
Level 2: 60%+
AIPMT - 2002
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The correct order of Ist IP(ionization potential) among the following elements Be, B, C, N, O is:

1. B < Be < C < O < N 2. B < Be < C < N < O
3. Be < B < C < N < O 4. Be < B < C < O < N
Subtopic:  Ionization Energy (IE) |
 84%
Level 1: 80%+
AIPMT - 2001
Hints

The basic theme of the periodic table is:

1. To classify the elements in a period according to their properties.
2. To classify the elements in a group according to their ionization enthalpy.
3. To classify the elements in periods and groups according to their properties.
4. To classify the elements in periods and groups according to their lustre.

Subtopic:   Evolution of Periodic Table |
 87%
Level 1: 80%+
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Property used by Mendeleev to classify the elements was:

1. Brightness

2. Atomic weight or mass

3. Number of isotopes

4. Lustre

Subtopic:   Evolution of Periodic Table |
 95%
Level 1: 80%+
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The basic difference between Mendeleev’s Periodic Law (A) and Modern Periodic Law (B) is:

1. A is based on atomic weights while B is based on atomic numbers. 
2. B is based on atomic weights while A is based on atomic numbers.
3. A is based on the number of isotopes while B is based on atomic numbers. 
4. A is based on physical properties while B is based on chemical properties. 

Subtopic:   Evolution of Periodic Table |
 91%
Level 1: 80%+
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The number of elements in the 6th period of the periodic table is-

1. 32

2. 36

3. 35

4. 33

Subtopic:  Electronic Configuration |
 87%
Level 1: 80%+
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The period and group number of the element with Z =114 are:

1. 8th period and 16th group 2. 7th period and 14th group
3. 14th period and 7th group 4. 9th group and 14th period
Subtopic:  Electronic Configuration |
 86%
Level 1: 80%+
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