
(a)
Interpretation:
Identification of the atom through ground state electronic configuration.
Concept Introduction:
From outer electronic configuration group number of the element can be determined.
From total number of the electrons
(a)

Answer to Problem 73A
The element is sulphur
Explanation of Solution
The outer electronic configuration is
Complete electronic configuration is
Hence the element is sulphur.
(b)
Interpretation:
Identification of the atom through excited state electronic configuration.
Concept Introduction:
When an atom is excited electrons are promoted from lower energy level to higher energy level.
(b)

Answer to Problem 73A
The element is Nitrogen (N)
Explanation of Solution
From the orbital diagram it is obvious that one electron is promoted from
Ground state electronic configuration of the atom is
Hence, the atom is nitrogen.
(c)
Interpretation:
Identification of the atom through electronic configuration of its anion.
Concept Introduction:
Anion with
(c)

Answer to Problem 73A
The element is Selenium (Se) and the ion is
Explanation of Solution
The electronic configuration of the ion is
So, to get the neutral atom we have to remove one electron from the
Electronic configuration of the neutral atom is
So, the atomic number of the element is 33 and hence the element is Se.
The ion is
Chapter 11 Solutions
World of Chemistry, 3rd edition
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