The outermost electronic configuration of the most electro negative element is
ns2np5
ns2np4
ns2np3
ns2np2
The electron affinity of Cl is -349 KJmol-1. The energy given out when 1 g of Cl atoms are converted into Cl-(g) is
9.8KJ
98.3KJ
983KJ
3.49KJ
The isoelectronic species K+, Cl-, S2- and Ca2+ can be arranged in the decreasing order of their size as
S2- > Cl- > K+ > Ca2+
Ca2+ > K+ > Cl- > S2-
Cl- > S2- > K+ > Ca2+
S2- > Cl- > Ca2+>K+
The element of atomic number 8 is closest in chemical properties of the elements having atomic number
7
9
18
16
Number of liquid elements present in the periodic table is
2
3
14
36
The lighest metal in the periodic table is
Na
H
K
Li
Second ionisation potential of an element is invariably higher than its first ionization potential because
The size of the cation is smaller than its atom.
It is difficult to remove electron from cation
Effective nuclear charge is more for cation
All
Out of the following the pair which is isoelectronic and isostructural is
SO3,NO3-
ClO3-, CO2-3
CO22-, SO3
NO-3, CO2-3
Out of the following pairs, the one in which both the species have nearly the same size is
Li+, Mg2+
Fe, Co
Rb+, 02-
All the three
The property of alkaline earth metals that increases with their atomic number is
Ionization energy
Electro negativity
Solubility of their sulphates
Solubility of their hydroxides
