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Thursday, September 17, 2020
What are the increasing order of molar conductivity of first group elements in water ?
(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?
What are the increasing order of ioni radii of first group elements in water ?
(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 molar conductivity of first group elements in water ?
Monday, July 20, 2020
Ionization energy of Boron is smaller than Beryllium even though effective nuclear charge is higher?
The
electronic configurations of Boron and Beryllium are (5B=1S2,2S2,2p1)
and (4Be =1S2,2S2).
In Boron the
outermost electron is present in the 2p orbital (low penetration power) and is
less strongly bound than the electron present in a 2S orbital of Beryllium (Have
more penetration power), which will has a higher Zeff. It is easier to ionize
the Boron 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) What are the increasing order of ioni radii of first group elements in water ?
(15) What are the increasing order of molar conductivity of first group elements in water ?
Thursday, June 18, 2020
Of all noble metals, gold has got a relatively high electron affinity. Explain.
(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) Ionization energy of Boron is smaller than Beryllium even though effective nuclear charge is higher?
(14) What are the increasing order of ioni radii of first group elements in water ?
(15) What are the increasing order of molar conductivity of first group elements in water ?
Li2CO3 decomposes on heating but other alkali metal carbonates don’t. Explain.
(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) Of all noble metals, gold has got a relatively high electron affinity. Explain.
(13) Ionization energy of Boron is smaller than Beryllium even though effective nuclear charge is higher?
(14) What are the increasing order of ioni radii of first group elements in water ?
(15) What are the increasing order of molar conductivity of first group elements in water ?
The electronegativities of B, Al, Ga are 2.0, 1.5, 1.6 respectively. The trend is not regular. Explain.
(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) Li2CO3 decomposes on heating but other alkali metal carbonates don’t. Explain.
(12) Of all noble metals, gold has got a relatively high electron affinity. Explain.
(13) Ionization energy of Boron is smaller than Beryllium even though effective nuclear charge is higher?
(14) What are the increasing order of ioni radii of first group elements in water ?
(15) What are the increasing order of molar conductivity of first group elements in water ?
The first ionization energy of carbon atom is greater than that of boron atom, whereas reverse is true for the second ionization energy. Explain.
The electronic configuration of carbon and boron are as follows:
C: 1S2,2s2, 2px1,2py1
B: 2S2, 2s2,
2px1
Due to higher nuclear charge in carbon, the force of attraction towards
valency electron is more in carbon atom and hence the first ionization energy
is greater than boron atom. After loss of one electron, the mono-valent cations
have the configurations as follows:
C: 1S2 ,2s2 2px1,
B: 2S2 , 2s2,
Configuration of B+ is stable one and hence the removal of electron is
difficult in comparison to C+. Hence, second ionization potential of boron is
higher than carbon.
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