Question 1

Which of the following elements has five valence electrons?

Accepted Answer

As (Arsenic) has five valence electrons, which is characteristic of elements in group 15 of the periodic table.

Question 2

Which of the following elements has 2 valence electrons?

Accepted Answer

Calcium (Ca) is in Group 2 of the periodic table, which means it has 2 valence electrons.

Question 3

How many valence electrons are in the IF₂^- ion?

Accepted Answer

Iodine (I) has 7 valence electrons, each fluorine (F) has 7 valence electrons, and the negative charge adds 1 more electron: 7 + 2(7) + 1 = 22.

Question 4

Which of the following species has all its electrons paired?

Accepted Answer

Zn in its +2 oxidation state (as indicated by the notation Zn²⁺) has a completely filled d10 configuration, meaning all its electrons are paired.

Question 5

How many $\textbf{ pairs }$ of nonbonding electrons are in the valence shell of the iodine atom in the IF₂^- ion?

Accepted Answer

The answer of How many \(\textbf{    ...

Question 6

How many $\textbf{ pairs }$ of nonbonding electrons are in the valence shell of the iodine atom in the ICl₄^- ion?

Accepted Answer

Iodine (I) in the ICl4^- ion has 7 valence electrons. When forming the ion, iodine shares one electron with each of the four chlorine atoms and has one extra electron due to the negative charge, making a total of 8 electrons in its valence shell. These are arranged as four pairs, with two pairs involved in bonding with chlorine atoms and two pairs remaining as nonbonding (lone pairs). Therefore, there are 2 pairs of nonbonding electrons.

Question 7

How many nonbonding $\textbf{     electrons     }$ are on the central atom in the Lewis structure of xenon tetrafluoride?

Accepted Answer

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Question 8

How many $\textbf{ pairs }$ of bonding electrons can be found in the valence shell of The nitrogen atom in HNO₂? (Hint: the skeleton structure is HONO)

Accepted Answer

In the molecule HONO (which is a way to represent nitrous acid, HNO2), the nitrogen atom forms three bonds: one with an oxygen atom (single bond), another oxygen atom (double bond), and a hydrogen atom. Each bond represents a pair of bonding electrons, totaling three pairs of bonding electrons in the valence shell of the nitrogen atom.

Question 9

How many $\textbf{      pairs   }$  of nonbonding electrons can be found on the chlorine atom in chlorous acid, HOClO?

Accepted Answer

Chlorous acid (HOClO) has a chlorine atom with 7 valence electrons. In its structure, chlorine is bonded to an oxygen atom (double bond) and another oxygen atom that is also bonded to a hydrogen atom (single bond), using a total of 4 electrons for bonding. This leaves 3 electrons unpaired, but since electrons are in pairs, this means there are 2 pairs of nonbonding electrons on the chlorine atom.

Question 10

Which of the following elements would form an XF₆^2- ion that has no nonbonding electrons in the valence shell of the central atom?

Accepted Answer

Si (Silicon) is the correct answer because when forming the described ion, it would have a valence shell configuration that allows for no nonbonding electrons. The notation XF₆^2- describes a specific electron configuration and bonding situation. Silicon, with its four valence electrons, can form four bonds without any nonbonding (lone pair) electrons in its valence shell, fitting the description provided.

Question 11

Nitrous oxide (N₂O) is an anesthetic commonly known as "laughing gas." Which of the following is a correct Lewis structure for this compound?

Accepted Answer

The answer of Nitrous oxide (N₂O) is an anesthetic commonly...

Question 12

Which element would form XF₅ for which there are no nonbonding electrons in the Lewis structure?

Accepted Answer

Phosphorus (P) can form PF5, where it uses all its valence electrons for bonding, resulting in no nonbonding electrons in the Lewis structure.

Question 13

If X is a 3rd row element and XCl₃ has the Lewis structure X must be:

Accepted Answer

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Question 14

If the XF₆^- ion has the Lewis structure X could be which of the following elements?

Accepted Answer

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Question 15

Assume that the XF₃ molecule has the following Lewis structure. The molecule could be:

Accepted Answer

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Question 16

Which of the following elements would form a compound with the following Lewis structure?

Accepted Answer

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Question 17

If there are two pairs of nonbonding electrons in the valence shell of the central atom in the XF₄^- ion, in which Group of the periodic table does the element X belong?

Accepted Answer

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Question 18

What is element X in the following Lewis structure?

Accepted Answer

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Question 19

Which of the following species contains only single bonds?

Accepted Answer

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Question 20

Which of the following would be the best Lewis structure for NOCl?

Accepted Answer

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Quiz 4: The Covalent Bond

Which of the following elements has five valence electrons?

Which of the following elements has 2 valence electrons?

How many valence electrons are in the IF2- ion?

Which of the following species has all its electrons paired?

How many pairs \textbf{ pairs } pairs of nonbonding electrons are in the valence shell of the iodine atom in the IF2- ion?

How many pairs \textbf{ pairs } pairs of nonbonding electrons are in the valence shell of the iodine atom in the ICl4- ion?

How many nonbonding electrons \textbf{ electrons } electrons are on the central atom in the Lewis structure of xenon tetrafluoride?

How many pairs \textbf{ pairs } pairs of bonding electrons can be found in the valence shell of The nitrogen atom in HNO2? (Hint: the skeleton structure is HONO)

How many pairs \textbf{ pairs } pairs of nonbonding electrons can be found on the chlorine atom in chlorous acid, HOClO?

Which of the following elements would form an XF62- ion that has no nonbonding electrons in the valence shell of the central atom?

Nitrous oxide (N2O) is an anesthetic commonly known as "laughing gas." Which of the following is a correct Lewis structure for this compound?

Which element would form XF5 for which there are no nonbonding electrons in the Lewis structure?

If X is a 3rd row element and XCl3 has the Lewis structure X must be:

If the XF6- ion has the Lewis structure X could be which of the following elements?

Assume that the XF3 molecule has the following Lewis structure. The molecule could be: