For a diatomic Hetero molecule:
Bond Length (l) = rA + rB- 0.09(XA-XB)
Where XA= Electronegativity of more electronegative atom
Where XB= Electronegativity of less electronegative atom
(1) What are the Amphoteric metals ? gives
Examples.
(2) Name of total metalloids present in periodic
table ?
(3) Total numbers of elements which are liquid
at normal temperature is ?
(4) What is Mendeleev's periodic table ? give
important features and draw back of Mendeleev's table.
(5) What is atomic density ? give the
periodicity of atomic density in periods and groups.
(6) What is atomic volume ? and what is
periodicity of atomic volume in groups and periods ?
(7) Why there are 2, 8 and 8 elements in first,
second and third periodic of periods table respectively ? Explain.
(8) In alkali metal group which is the strongest
reducing agent in aqueous solution and why?
(9) The electron affinity of sulphur is greater
than oxygen. Why?
(10) The first ionization energy of carbon atom
is greater than that of boron atom, whereas reverse is true for the second
ionization energy. Explain.
(11) The electronegativities of B, Al, Ga are
2.0, 1.5, 1.6 respectively. The trend is not regular. Explain.
(12) Li2CO3 decomposes on heating but other
alkali metal carbonates don’t. Explain.
(13) Of all noble metals, gold has got a
relatively high electron affinity. Explain.
(14 Ionization energy of Boron is smaller than
Beryllium even though effective nuclear charge is higher?
(15) What are the increasing order of ioni radii
of first group elements in water ?
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