
(b)
Interpretation:
Theelement name, symbol and group number for the atom needs to be determined.
Concept introduction:
The atomic symbol for an element is represented as follows:
Here, A is mass number and Z is
For an atom,

Answer to Problem 7E
Element name=Chlorine, Symbol=Cl and Group number=17
Explanation of Solution
This is actual
Thus, the given element is chlorine. Symbol for the element is Cl and group number is 17 as the atomic number is 17.
(b)
Interpretation:
The number of protons in nucleus of chlorine atom needs to be determined.
Concept introduction:
The atomic symbol for an element is represented as follows:
Here, A is mass number and Z is atomic number.
For an atom,

Answer to Problem 7E
Number of protons in nucleus of chlorine=17
Explanation of Solution
This is actual representation of element configuration
Thus, the given element is chlorine. Symbol for the element is Cl and group number is 17 as the atomic number is 17.
Since, number of protons is equal to atomic number thus, number of protons is equal to 17.
(c)
Interpretation:
The number of neutrons in nucleus of chlorine needs to be determined.
Concept introduction:
The atomic symbol for an element is represented as follows:
Here, A is mass number and Z is atomic number.
For an atom,

Answer to Problem 7E
Number of neutrons in nucleus of chlorine=18
Explanation of Solution
This is actual representation of element configuration
This is the configuration of Chlorine according to the periodic table.
The neutrons are 18
(d)
Interpretation:
The number of electrons in nucleus of chlorine needs to be determined.
Concept introduction:
The atomic symbol for an element is represented as follows:
Here, A is mass number and Z is atomic number.
For an atom,

Answer to Problem 7E
Number of electrons in nucleus of chlorine=17.
Explanation of Solution
This is actual representation of element configuration
This is the configuration of Chlorine according to the periodic table.
According to this equation, the number of protons is 17 so the number of electrons is 17.
(e)
Interpretation:
The number of electrons in valence shell needs to be determined.
Concept introduction:
The atomic symbol for an element is represented as follows:
Here, A is mass number and Z is atomic number.
For an atom,
(e)

Answer to Problem 7E
Number of electrons in nucleus of chlorine=17 and in valence shell=7
Explanation of Solution
This is actual representation of element configuration
The electronic configuration is [Ne] 3s2 3p5. These are 7 valence electrons.
(f)
Interpretation:
The number of electrons in core shell needs to be determined.
Concept introduction:
The atomic symbol for an element is represented as follows:
Here, A is mass number and Z is atomic number.
For an atom,
(f)

Answer to Problem 7E
Number of electrons in nucleus of chlorine=17 and in valence shell=7 thus, the remaining electron is 10.
Explanation of Solution
This is actual representation of element configuration
The electronic configuration is [Ne] 3s2 3p5. These are 7 valence electrons. The remaining number of electrons is 10.
(f)
Interpretation:
The examples of 3 elements similar to chlorine needs to be given
Concept introduction:
The atomic symbol for an element is represented as follows:
Here, A is mass number and Z is atomic number.
For an atom,
(f)

Answer to Problem 7E
The fluorine, bromine and iodine are the similar elements of chlorine.
Explanation of Solution
The electronic configuration of chlorine is [Ne] 3s2 3p5. Thus, it belongs to halogen family. The other elements in this group are fluorine, bromine and iodine.
Chapter U1 Solutions
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