Which block consists of elements of groups 13(IIIA),14 (IVA) 15(VA),16(VIA),17(VIIA) and 18 ?
s
p
d
f
The fourteen elements from Th to Lr are known as
Actinides
Lanthanides
Alkali metals
Noble gases
According to whom's periodic Law,the physical and chemical properties of the elements are the periodic functions of their atomic weights?
Mendeleev's
Cooke's
William Prout's
Rutherford's
The long form of the periodic table is based upon the
atomic number
atomic mass
isotopic mass
molecular weight
With which of the following electronic configuration an atom has the lowest ionisation enthalpy ?
1s2 ,2s2 2p5
1s2 ,2s2 2p3
1s2 ,2s2 2p5 3s1
1s2 ,2s2 2p6
Which one of the following arrangements does not truly represent the property indicated against it ?
Br2 < Cl2 < F2 : Oxidising power
The fourteen elements from Ce to Lu are known as
Alkalimetals
In the modified form of Mendeleev's periodic table,all the known elements have been arranged in ten horizontal columns called
block
class
period
series
The ions are isoelectronic. Their ionic radii show
an increase from O2- to F- and then decrease from Na+ to Al3+
a decrease from O2- to F- and then increase from Na+ to Al3+
a significant decrease from O2- to Al3+
a significant increase from O2- to Al3+
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
