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The band model of solids is an extended of the molecular orbital (MO) method. The overlap of atomic orbitals in an extended solid produces rise to continuous bands of electronic energy levels associated with different degrees of bonding. In a simple monatomic solid the bottom of the band is build up of orbitals bonding between all neighboring atoms; orbitals at the top of the band are antibonding, and levels in the middle have an intermediate bonding character. Different atomic orbitals may, in principle, give rise to different bands, although they may overlap in energy.
Fig. 1. Band picture for (a) nonmetallic and (b) metallic solid; occupied electronic levels are shown shaded.
Increases in temperature approximately in accordance with the Arrhenius equation used in chemical kinetics.
How much NaCl is needed to prepare a 0.5 solution of 5 Ltires?
Q. Define Conjugate acid-base pair and buffer? Buffers are substances that resist changes in pH. To "balance pH" means to buffer. Weak acids and bases make good buffers.
Prove that the number of orbitals in a principal quantum level is n^2 using the fact that the number of orbitals in a subshell is (2L-1) where L is the azimuthal quantum number.
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If hydrogen atom is in an energy level represented by n=4,how many spectral lines are possible in its emission spectrum? Ans) There is a formula for this i.e [ (n 2- n 1 +1)
Q. Atomic mass of an element? The number at the bottom of every square in the periodic table is the atomic mass of that element in amu. A scan of the periodic table will withou
Which of the following set of quantum numbers belong to highest energy: (1) n=4, l=0, m=0, s= +1/2 (2) n=3, l=0, m=0, s= +1/2 (3) n=3 l=1, m=1, s
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