
Concept explainers
Interpretation: The given table needs to be completed.
Name | Symbol | Mass number | Number of neutrons | |
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Platinum |
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Mercury |
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Phosphorus |
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Concept Introduction :
The number of protons in an atom is called the atomic number. The addition of the number of protons and neutrons, is equal to the mass number. When the numbers of neutrons are different the mass number of element is changes but atomic number remains unchanged that consider as a isotope of the element.

Answer to Problem 30A
The complete table given as -
Name | Symbol | Atomic number | Mass number | Number of neutrons |
Sulfur |
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Potassium |
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Neon |
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Platinum |
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Plutonium |
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Tellurium |
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Mercury |
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Calcium |
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Bromine |
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Phosphorus |
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Explanation of Solution
Name | Symbol | Atomic number | Mass number | Number of neutrons |
Sulfur |
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Potassium |
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Neon |
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Platinum |
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Plutonium |
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Tellurium |
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Mercury |
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Calcium |
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Bromine |
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Phosphorus |
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The number of protons is equal to the atomic number of the element.
The mass number= number of protons + number of neutrons.
The number of electrons is equal to the number of protons.
So for the incomplete table −
For the
The atomic number=
The mass number =
So for the number of neutrons = mass number − number of protons
The number of neutrons=
The element name is sulfur.
For the atomic number =
So the mass number = number of protons+ number of neutrons
So the given element is potassium and the symbol is
For the atomic mass=
So for the number of neutrons = mass number − number of protons
So the given element is neon and the symbol is
For the Platinum The atomic number=
The mass number =
So for the number of neutrons = mass number − number of protons
The number of neutrons=
For the
The atomic number=
The mass number =
So for the number of neutrons = mass number − number of protons
The number of neutrons=
For the
The atomic number=
The mass number =
So for the number of neutrons = mass number − number of protons
The number of neutrons=
So the given element is Tellurium.
For the mercury
The atomic number=
The mass number =
So for the number of neutrons = mass number − number of protons
The number of neutrons=
For the atomic number =
So for the number of neutrons = mass number − number of protons
The number of neutrons=
For the
The atomic number=
The mass number =
So for the number of neutrons = mass number − number of protons
The number of neutrons=
For the phosphorus
The atomic number=The mass number =
The number of neutrons=
So the mass number = number of protons+ number of neutrons
So the given element is phosphorus and symbol is
The number of neutrons and electrons present in an atom and give the information about the specific elements. The protons are the equal to number of electrons and the numbers of protons are explains the atomic number of the element.
Chapter 3 Solutions
World of Chemistry, 3rd edition
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- Part I. Draw reaction mechanism for the transformations of benzophenone to benzopinacol to benzopinaco lone and answer the ff: Pinacol (2,3-dimethyl, 1-3-butanediol) on treatment w/ acid gives a mixture of pina colone and (3,3-dimethyl-2-butanone) 2,3-dimethyl-1,3-butadiene. Give reasonable mechanism the formation of the products Forarrow_forwardShow the mechanism for these reactionsarrow_forwardDraw the stepwise mechanismarrow_forward
- Draw a structural formula of the principal product formed when benzonitrile is treated with each reagent. (a) H₂O (one equivalent), H₂SO₄, heat (b) H₂O (excess), H₂SO₄, heat (c) NaOH, H₂O, heat (d) LiAlH4, then H₂Oarrow_forwardDraw the stepwise mechanism for the reactionsarrow_forwardDraw stepwise mechanismarrow_forward
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