P block elements
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How many grps are in p block
6
The exception of p block electronic configuration is
He
The maximum oxidation number of p block is
Total number of valence electrons in s and p
The occurrence of oxidation state two units less than the grp oxidation state is because of
Inert pair effect
For heavier elements the stable oxidation state would be
Two unit less than grp oxidation state
Where in the periodic table does non Metals and metalloids exist
P block
Which has higher ionization enthalpy and high electronegativity
Non metals
The first members of p block difrers from other members in their ability to form p pi = p pi bonds
True
The heavier elements of p block forms p pi = d pi bonds or d pi= d pi bonds
True
As d orbitals are of high energy they contribute less to the stability of the molecules than p pi = P pi bond
True
Boron occurs as
Orthoboric acid ( H3BO3) Kernite Na2B4O7.4 H2O Borax Na2B4O7. 10 H20
Important ore of aluminium is
Bauxite Al2O3.2H20 Cryolite Na3AlF6
The atomic radius of Ga is less than that of Al
Due to Poor screening effect
The reason for decrease in ionization enthalpy between B and Al
Increase in size
The reason for decrease in ionization enthalpy Al and Ga, In and Tl is due to
Low screening effect of d and f electrons
The electronegativity in 13th grp decreases from
B to Al
The electronegativity in 13th grp Increases from
Al to Tl
Tendency to form Lewis acid decreases with
Increase in size down the grp
AlCl3 achieves stability as a dimer
True
Boron is reactive in chtystalline form
False
Amorphous Boron is reactive
True
Boron trioxide is
Acidic in natureb
Aluminium and Gallium oxides
Amphoteric oxides
Indium and thallium oxides are
Basic