Boron has lesser ionization enthalpy than Beryllium, because -

1.  It is easier to remove electrons from p - a subshell than a filled s - subshell.
2.  The s-electron can be removed easier than the p-electron.
3.  Ionization enthalpy decreases with an increase in atomic number.
4.  Ionization enthalpy increases along the period.

Subtopic:  Ionization Energy (IE) |
 84%
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Difference between electron gain enthalphy and electronegativity is described by :

1) Valence electrons

2) Atomic size

3) Atomic radii

3) Atomic number

Subtopic:  Electronegativity | Electron Affinity (EA) |
 70%
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Incorrect statement about metal is:

1. Metals can donate electrons.
2. Metals form ionic compounds.
3. Metals are more electronegative.
4. Metals have less ionization energy.

Subtopic:  Nature of Compound |
 85%
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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 |
 55%
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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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Incorrect statement among the following is :

1. The p-block has 6 columns because a maximum of 6 electrons can occupy all the orbitals in a p-shell.
2. The d-block has 8 columns because a maximum of 8 electrons can occupy all the orbitals in a d-subshell.
3. Each block contains a number of columns equal to the number of electrons that can occupy that subshell.
4. The s- block contains mainly reactive metals.

Subtopic:  Modern Periodic Table & Periodicity |
 82%
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The element named after Lawrence Berkeley Laboratory is: 

1. Seaborgium 2. Lawrencium
3. Moscovium 4. Hafnium
Subtopic:  Modern Periodic Table & Periodicity |
 88%
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The maximum number of elements that can be accommodated in the sixth period are :

1.  8

2. 18

3. 32

4 16

Subtopic:  Electronic Configuration |
 86%
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The correct order of their chemical reactivity of the elements F, Cl, O and N in terms of oxidizing property is :

1. F > Cl > O > N

2. F > O > Cl > N

3. Cl > F > O > N

4. O > F > N > Cl

Subtopic:  Nature of Compound |
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Considering the elements B, C, N, F, and Si; the correct order of their non-metallic character is :

1. B > C > Si > N > F 2. Si > C > B > N > F
3. F > N > C > B > Si 4. F > N > C > Si > B
Subtopic:  Nature of Compound |
 61%
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