
(a)
Interpretation:
The nuclear charge of the element needs to be calculated.
Concept Introduction:
The nuclear charge is equal to the number of protons.
The mass number is the sum of protons and neutrons. And hence,
(a)

Answer to Problem 70A
The nuclear charge of the element is
Explanation of Solution
Here,
•
•
(b)
Interpretation:
The symbol and name of the element need to be determined.
Concept Introduction:
The
(b)

Answer to Problem 70A
The
Explanation of Solution
Hence, the atomic number of the element is also
The atomic number
(c)
Interpretation:
The number of valence electrons is to be determined.
Concept Introduction:
For the neutral atom,
From electronic configuration, valence electrons can be determined.
(c)

Explanation of Solution
The electronic configuration of Hg is
Valence electrons are outer electrons of the shell. So, for Hg, valence electrons are two.
(d)
Interpretation:
The energy level is to be determined.
Concept Introduction:
The number of energy levels is the possible levels around the nucleus where electrons are present. It depends on the period number of an element. For example, elements in the 1st period have 1 energy level, elements in the 2nd period have 2 energy levels and so on.
(d)

Answer to Problem 70A
The number of energy levels is 5.
Explanation of Solution
The number of electrons in a neutral atom is 40 thus, the electronic configuration will be:
Since the outermost electron is present in the 5th shell, thus; the number of energy levels will be 5.
Chapter 11 Solutions
World of Chemistry
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