
(a)
Interpretation:
The electronic configuration of B from its location in the periodic table has to be determined.
Concept Introduction:
The electronic configuration is defined as the distribution of electrons in various atomic orbitals of the atom. The electrons that are present in outermost orbital are known as valence electrons whereas those present in the orbitals with lower quantum numbers are called core electrons. The general outer electronic configuration of s block elements is ns1−2, that of p block elements is ns2np1−6, that of d−block elements is (n−1)d1−10ns0−2 and that of f block elements is (n−2)f1−14(n−1)d0−10ns2.
Electrons are filled in orbitals in accordance with three rules: Aufbau principle, Hund’s rule, and Pauli’s exclusion principle. Aufbau principle states that electrons are filled in the orbitals from lower to higher energy level as follows:
1s<2s<2p<3s<3p<4s<3d<4p<5s<4d<5p<6s<4f<5d<6p<7s
Hund’s rule states that initially each orbital is singly occupied and then pairing occurs and Pauli’s exclusion principle states that the spin of two electrons in one orbital is always different.
(a)

Answer to Problem 8.26QE
The electronic configuration of B is 1s22s22p1.
Explanation of Solution
According to the location of B, its
(b)
Interpretation:
The electronic configuration of Bi from its location in the periodic table has to be determined.
Concept Introduction:
Refer to part (a).
(b)

Answer to Problem 8.26QE
The electronic configuration of Bi is 1s22s22p63s23p64s23d104p65s24d105p66s24f145d106p3.
Explanation of Solution
According to the location of Bi in the periodic table, its atomic number is 83. So it has 83 electrons in it and therefore its electronic configuration is 1s22s22p63s23p64s23d104p65s24d105p66s24f145d106p3.
(c)
Interpretation:
The electronic configuration of Ba from its location in the periodic table has to be determined.
Concept Introduction:
Refer to part (a).
(c)

Answer to Problem 8.26QE
The electronic configuration of Ba is 1s22s22p63s23p63d104s24p64d105s25p66s2.
Explanation of Solution
According to the location of Ba, its atomic number is 56. So it has 56 electrons in it and therefore its electronic configuration is 1s22s22p63s23p63d104s24p64d105s25p66s2.
(d)
Interpretation:
The electronic configuration of Cd from its location in the periodic table has to be determined.
Concept Introduction:
Refer to part (a).
(d)

Answer to Problem 8.26QE
The electronic configuration of Cd is 1s22s22p63s23p63d104s24p64d105s2.
Explanation of Solution
According to the location of Cd, its atomic number is 48. So it has 48 electrons in it and therefore its electronic configuration is 1s22s22p63s23p63d104s24p64d105s2.
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Chapter 8 Solutions
Chemistry: Principles and Practice
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