Concept explainers
Write the correct symbols for the atoms that contain: (a) 25 protons, 25 electrons, and 27 neutrons; (b) 10 protons, 10 electrons, and 12 neutrons; (c) 47 protons, 47 electrons, and 60 neutrons; (d) 53 protons, 53 electrons, and 74 neutrons; (e) 94 protons, 94 electrons, and 145 neutrons.
(a)

Interpretation:
Correct symbol for the atoms contains 25 protons, 25 electrons and 27 neutrons has to be written.
Concept Introduction:
Mass number (A): Mass number of an element is sum of protons and neutrons of the atom.
Consider an element X with atomic number and mass number,
Where,
A is mass number and Z is atomic number (number of proton or electron)
Answer to Problem 2.64QP
The symbol for given atom is found as
Explanation of Solution
Given:
Number of protons: 25
Number of neutrons: 27
Number of electrons: 25
The atomic number 25 represents the element Manganese. The sum of protons and neutrons in the nucleus give the mass number of an element. Hence, the symbol is
(b)

Interpretation:
Correct symbol for the atoms contains 10 protons, 10 electrons and 12 neutrons has to be written.
Concept Introduction:
Mass number (A): Mass number of an element is sum of protons and neutrons of the atom.
Consider an element X with atomic number and mass number,
Where,
A is mass number and Z is atomic number (number of proton or electron)
Answer to Problem 2.64QP
The symbol for given atom is found as
Explanation of Solution
Given:
Number of protons: 10
Number of neutrons: 12
Number of electrons: 10
The atomic number 10 represents the element Neon. The sum of protons and neutrons in the nucleus give the mass number of an element. Hence, the symbol is
(c)

Interpretation:
Correct symbol for the atoms contains 47 protons, 47 electrons and 60 neutrons has to be written.
Concept Introduction:
Mass number (A): Mass number of an element is sum of protons and neutrons of the atom.
Consider an element X with atomic number and mass number,
Where,
A is mass number and Z is atomic number (number of proton or electron)
Answer to Problem 2.64QP
The symbol for given atom is found as
Explanation of Solution
Given:
Number of protons: 47
Number of neutrons: 60
Number of electrons: 47
The atomic number 47 represents the element Silver. The sum of protons and neutrons in the nucleus give the mass number of an element. Hence, the symbol is
(d)

Interpretation:
Correct symbol for the atoms contains 53 protons, 53 electrons and 74 neutrons has to be written.
Concept Introduction:
Mass number (A): Mass number of an element is sum of protons and neutrons of the atom.
Consider an element X with atomic number and mass number,
Where,
A is mass number and Z is atomic number (number of proton or electron)
Answer to Problem 2.64QP
The symbol for given atom is found as
Explanation of Solution
Given:
Number of protons: 53
Number of neutrons: 74
Number of electrons: 53
The atomic number 53 represents the element Iodine. The sum of protons and neutrons in the nucleus give the mass number of an element. Hence, the symbol is
(e)

Interpretation:
Correct symbol for the atoms contains 94 protons, 94 electrons and 145 neutrons has to be written.
Concept Introduction:
Mass number (A): Mass number of an element is sum of protons and neutrons of the atom.
Consider an element X with atomic number and mass number,
Where,
A is mass number and Z is atomic number (number of proton or electron)
Answer to Problem 2.64QP
The symbol for given atom is found as
Explanation of Solution
Given:
Number of protons: 94
Number of neutrons: 145
Number of electrons: 94
The atomic number 94 represents the element Plutonium. The sum of protons and neutrons in the nucleus give the mass number of an element. Hence, the symbol is
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Chapter 2 Solutions
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