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Which one of the following has the highest electronegativity?

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Important Questions on Classification of Elements and Periodicity in Properties

EASY
When the first electron gain enthalpy (ΔHeg) of oxygen is -141 kJ/mol , its second electron gain enthalpy is:
MEDIUM
In which of the following options the order of arrangement does not agree with the variation of property indicated against it?
EASY
Which of the following indicates the correct variation in eletronegativities?
EASY
The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na + will be :
EASY
The effective nuclear charge of an element with three valence electrons is 2.60 . What is the atomic number of the element?
EASY

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) 

MEDIUM
Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar ?
EASY
The species Ar, K+ and Ca2+  contain the same number of electrons. In which order do their radii increase?
EASY
The first ionization enthalpies for three elements are 1314, 1680 and 2080 kJ mol-1 , respectively. The correct sequence of the element is:
MEDIUM
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