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The correct order of reactivity of halogens is

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Important Questions on Classification of Elements and Periodicity in Properties

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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronegativity and its Applications
When the first electron gain enthalpy (ΔHeg) of oxygen is -141 kJ/mol , its second electron gain enthalpy is:
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronegativity and its Applications
The correct order of electronegativity for given elements is
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronegativity and its Applications
In which of the following options the order of arrangement does not agree with the variation of property indicated against it?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronegativity and its Applications
The electronegativities of N, C, Si and P are in the order -
EASY
Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronegativity and its Applications
Which of the following indicates the correct variation in eletronegativities?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronegativity and its Applications
The formation of the oxide ion, O2-(g) , from oxygen atom requires first an exothermic and then an endothermic step as shown in below:

Og+e-⟶O-g   ;  ΔfH⊖=-141 kJ mol-1

O-g+e-⟶O2- g ;  ΔfH⊖=+780 kJ mol-1

Thus process of formation of O2- in gas phase is unfavourable though O2- is isoelectronic with neon. It is due to the fact that,
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronegativity and its Applications
The ionic radii (in  Å) of N3-, O2-  and  F-  are respectively:
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronegativity and its Applications
The first ionization enthalpies for three elements are 1314, 1680 and 2080 kJ mol-1 , respectively. The correct sequence of the element is:
EASY
Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronegativity and its Applications
The most electronegative element from the following elements is:
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronegativity and its Applications

Arrange as directed:

S (16), O (8), Te (52), Se (34) belonging to Group 16 of the long periodic table according to increasing order of electronegativity. 

(The atomic numbers have been given within first brackets after the symbols of the elements) 

EASY
Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronegativity and its Applications
The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na + will be :
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronegativity and its Applications
The electronegativity of the given elements increases in the order
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronegativity and its Applications
Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar ?
EASY
Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronegativity and its Applications
The correct order of atomic radii is:
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronegativity and its Applications
The species Ar, K+ and Ca2+  contain the same number of electrons. In which order do their radii increase?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronegativity and its Applications
Which element has the highest first ionization potential?
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronegativity and its Applications
The effective nuclear charge of an element with three valence electrons is 2.60 . What is the atomic number of the element?
EASY
Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronegativity and its Applications
Most electronegativity element in the periodic table
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Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronegativity and its Applications
Given that ionization potential and electron gain enthalpy of chlorine are 13eV and 4eV respectively. The electronegativity of chlorine on Mulliken scale, approximately equals to
EASY
Chemistry>Inorganic Chemistry>Classification of Elements and Periodicity in Properties>Electronegativity and its Applications
Identify the correct order of electronegativity for Mg,B,Si and S.