In crystals of which of the following ionic compounds would you expect maximum distance between centres of cations and anions ?
LiF
CsF
CsI
Lil
Amongst the elements with following electronic configuration, which one may have the highest ionisation energy ?
In the periodic table from left to right in a period, the atomic volume
decreases
increases
remains same
first decrease then increases
Which block consists of elements of groups 13(IIIA),14 (IVA) 15(VA),16(VIA),17(VIIA) and 18 ?
s
p
d
f
Ionic radii are
inversely proportional to effective nuclear charge
inversely proportional to square of effective nuclear charge
directly proportional to effective nuclear charge
directly proportional to square of effective nuclear charge
The fourteen elements from Ce to Lu are known as
Actinides
Lanthanides
Alkalimetals
Noble gases
Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy ?
Vanadium ( Z = 23 )
Chrmoium (Z = 24)
Iron (Z = 26)
Manganese (Z = 25)
Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species?
Cl < F < S < O
O < S < F < Cl
S < O< Cl < F
F < Cl < O < S
The first meaningful and remarkable contribution in the field of classification of elements was made by
William Prout
Mendeleev
Cooke
Rutherford
