Atomic Structure

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Atomic Structure

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Question 1

• Which statement is correct about the isotopes of
  an element?

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Wrong Answer!
Isotopes are 2 or more atoms of the same element
with different number of neutrons (and therefore
different relative isotope masses). They have the
same numbers of protons and hence the same number
of electrons.
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Question 2

• A chemical element with the symbol X has the
  electron arrangement 2,8,6. Which chemical
  species is this chemical element most likely to
  form?

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Wrong Answer!
H2S 2HX2-
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Question 3

• Which of the following particles contains more
  electrons than neutrons?
• I. II. III.
  

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Wrong Answer!

1. 1p 1e 0n
2. 17p 18e 18n
3. 19p 18e 20n

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Question 4

• What information about the structure of a helium
  atom can be gained from its emission spectrum?

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Wrong Answer!
Emission spectra provide evidence that electrons
exist in fixed energy levels within an atom.
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Question 5

• What is the correct number of each particle in a
  fluoride ion, 19F- ?
• Note
• p represents protons n represents neutrons e
  represents electrons

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Wrong Answer!
9 protons (from periodic table) 10 electrons in
the atom ( due to the single negative charge) and
10 neutrons (19-9)
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Question 6

• How many valence electrons are present in the
  element of atomic number 14?

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Wrong Answer!
The element is Silicon with the element
arrangement 2,8,4
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Question 7

• Which statement is correct about a line emission
  spectrum?

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Wrong Answer!
Electrons release energy as they move from high
to low energy levels. Light is released.
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Question 8

• What fraction of a radioisotope will remain after
  three half-lives?

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Wrong Answer!
1 ? ½ ? ¼ ? 1/8
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Question 9

• A particular element consists of two isotopes
  72 of mass number 85 and 28 of mass number 87.
  What is the expected range of the relative atomic
  mass?

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Wrong Answer!
Relative atomic mass is a weighted average. The
more abundant isotope has a mass number of
85. 72 x 85 28 x 87
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Question 10

• Which is the correct sequence for some of the
  various stages that typically occur in the
  analysis of an element during mass spectrometry?

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Wrong Answer!
The sample is first vaporized by lowering the
surrounding pressure. A mass spectrometer can
only accept gaseous atoms or molecules. The
molecules or atoms are then subjected to
bombardment by high energy electrons which remove
the valence electron to form unipositive ions.
The ions are then accelerated by an electric
field before entering a powerful magnetic field
where they experience deflection according to
their mass-to-charge ratio.
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Question 11

• The atomic numbers and mass numbers for four
  different nuclei are given in the table below.
  Which two are isotopes?
• Atomic number Mass number
• I 101 258
• II 102 258
• III 102 260
• IV 103 259

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Wrong Answer!

1. 157 neutrons
2. 156 neutrons
3. 158 neutrons
4. 156 neutrons

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Question 12

• Which electronic transition within a hydrogen
  atom requires the greatest energy?

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Wrong Answer!
Energy levels rapidly converge with an increase
in n.
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Congratulations!

• You have completed the quiz!