The group number that has non-metal, liquid as well as gas at room temperature is:

1. 15 2. 14
3. 18 4. 17

Subtopic:  Modern Periodic Table & Periodicity |
 56%
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Elements H1    H2    egH
    I    520   7300    -60
    II    419    3051   -48
   III    1681    3374   -328
   IV    1008   1846    -295
    V     2372     5251    +48
   VI      738     1451    -40
The least reactive element based on the above data is:

1. III
2. IV
3. II
4. V
Subtopic:  Ionization Energy (IE) | Electron Affinity (EA) |
 67%
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Among the following elements, identify the one that is not an actinoid :

1. Curium (Z=96) 2. Californium (Z=98)
3. Uranium (Z=92) 4. Terbium (Z=65)
Subtopic:  Modern Periodic Table & Periodicity |
 86%
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The order of screening effect of electrons of s, p, d and f orbitals of a given shell of an atom on electrons in its outer shell is :

1. s > p > d > f

2. f > d > p > s

3. p < d < f < s

4. f > p > s > d

Subtopic:  Screening Effect |
 93%
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The first ionisation enthalpies of Na, Mg, Al, and Si are in the order of:

1. Na < Al < Mg < Si

2. Na > Mg > Al > Si

3. Na < Mg < Al < Si

4. Na > Mg > Al < Si

Subtopic:  Ionization Energy (IE) |
 66%
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Among halogens, the correct order of amount of energy released in electron gain (electron gain enthalpy) is:

1. F > Cl > Br > I 2. F < Cl < Br < I
3. F < Cl > Br > I 4. F < Cl < Br > I
Subtopic:  Electron Affinity (EA) |
 82%
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The period number in the long form of the periodic table is equal to : 

1. Magnetic quantum number of any element of the period.
2. Atomic number of any element of the period.
3. Maximum principal quantum number of any element of the period.
4. Maximum azimuthal quantum number of any element of the period.

Subtopic:  Modern Periodic Table & Periodicity |
 79%
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The elements in which electrons are progressively filled in 4f-orbitals are called:

1. Actinoids 2. Transition elements
3. Lanthanoids 4. Halogens
Subtopic:  Modern Periodic Table & Periodicity |
 77%
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The correct order of size of the given species is: 

1.  I > I> I+

2.  I> I> I

3.  I > I> I-

4.  I> I > I+

Subtopic:  Atomic Size |
 94%
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The outermost electronic configuration of the last element of the p-block in the 6th period is represented by:

1. 7s27p6

2. 5f146d107s27p0

3. 4f145d106s26p6

4. 4f145d106s26p4

Subtopic:  Modern Periodic Table & Periodicity |
 78%
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