Na+ , Mg2+ , Al3+ and Si4+ are isoelectronic. The order of their ionic size is
Identify the correct order of the size of the following
Which theory states that the values of the atomic weights of all elements were whole numbers or varied only slightly from the whole numbers,if hydrogen was considered the basis of all atomic weights ?
Unitary theory
Dobereiner's triads
Cooke's homologous series
Huckel's theory
The fourteen elements from Th to Lr are known as
Actinides
Lanthanides
Alkali metals
Noble gases
Pauling's electro negativity values for elements are useful in predicting
polarity of the molecules
position in the emf series
coordination numbers
dipole moments
The correct order of decreasing second ionisation enthalpy of Ti (22), V(23), Cr(24) and Mn(25) is
Cr > Mn > V > Ti
V > Mn > Cr > Ti
Mn > Cr > T i > V
Ti > V > Cr > Mn
The electronic configuration of four elements are given below ,the element does not belong to the same family as others is
[Xe] 4f14 ,5d10 ,6s2
[Kr] 4d10 ,5s2
[Ne] 3s2 ,3p5
[Ar] 3d10 ,4s2
Which block consists of elements of groups 13(IIIA),14 (IVA) 15(VA),16(VIA),17(VIIA) and 18 ?
s
p
d
f
Which of the following does not represent the correct order of the properties indicated ?
Which one of the following orders is not in accordance with the property stated against it ?
