Question 1

Rubidium occurs naturally as two isotopes:  with a mass of 84.9117 amu and  with a mass of 86.9092 amu.Given that the atomic mass of rubidium is 85.47 amu,what are the natural abundances of the two isotopes?

Accepted Answer

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Question 2

The nucleus of an Ar-40 atom has a radius of 4.1 x 10^-15 m.An atom of Ar-40 has a radius of 9.4 x 10^-11m.The volume of a sphere can be calculated using the formula, .Assume that both the nucleus and the atom are spherical in shape. A.Calculate the volume of an Ar-40 nucleus. B.Calculate the volume of an Ar-40 atom. C.How many times larger is the volume of an Ar-40 atom than that of its nucleus?

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The answer of The nucleus of an Ar-40 atom has...

Question 3

Explain how Rutheford's gold foil experiment changed the model of the atom proposed by Thomson.

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Question 4

Rutherford's gold foil experiment proved that the volume of the atom is mostly empty space.

Accepted Answer

Rutherford's experiment showed that the majority of an atom's volume consisted of empty space, with a small, dense nucleus at its center.

Question 5

The nucleus of a C-12 atom has a radius of 2.7 x 10^-15m.An atom of C-12 has a radius of 7.7 x 10^-11m.The volume of a sphere can be calculated using the formula, . Assume that both the nucleus and the atom are spherical in shape. A.Calculate the volume of a C-12 nucleus. B.Calculate the volume of a C-12 atom. C.How many times larger is the volume of a C-12 atom than that of its nucleus?

Accepted Answer

The answer of The nucleus of a C-12 atom has...

Question 6

How are the different isotopes of an element alike;how are they different?

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Question 7

What is meant by the terms atom and ion? How are they alike and how are they different?Give examples.

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Question 8

Explain why the atomic masses of elements are not whole numbers.

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Question 9

These questions refer to an atom of the isotope ⁶⁵Cu. A.What is the atomic number of this element? B.What is the mass number of this isotope? C.How many protons,neutrons,and electrons are in this atom? D.What is the nuclear charge of this atom? E.What is the overall charge of this atom?

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The answer of These questions refer to an atom of...

Question 10

In 1911 Ernest Rutherford performed an experiment known as the "Gold Foil Experiment."
He fired a stream of positively charged alpha particles at a sheet of gold foil which was approximately 1000 atoms thick.Alpha particles have a mass of 4 amu and a charge of +2.
Almost all of the alpha particles passed straight through 1000 atoms of gold.A few particleswere deflected or even bounced back from the foil.Alpha particles are more than 7000 times more massive than electrons.What can you conclude regarding the structure of the atom from these observations?

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Question 11

Define in simple terms the concept of natural abundance for the isotopes of any element and how it determines the average atomic masses of the elements.

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Question 12

Compare and contrast the mass,electrical charge,and location of the three major subatomic particles.

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Quiz 5: Early Atomic Theory and Structure

Rubidium occurs naturally as two isotopes: with a mass of 84.9117 amu and with a mass of 86.9092 amu.Given that the atomic mass of rubidium is 85.47 amu,what are the natural abundances of the two isotopes?