$$3 \times 1 + 4 \times 7 + 1 = 32$$

Question 1

In Lewis Dot Structures, cations have ___ valence electrons and anions have ___ valence electrons. Fill in the blanks.

Accepted Answer

fewer, more

Question 2

What is the total number of valence electrons in the Lewis Dot Structure for the anion $$\mathrm{$$BCl_4$$^-}$$?

Accepted Answer

$$3 	imes 1 + 4 	imes 7 + 1 = 32$$

Question 3

When drawing a Lewis Dot Structure, which atom is typically placed in the center?

Accepted Answer

The atom with the lowest electronegativity

Question 4

According to the Octet Rule, how many valence electrons should surround most atoms in a Lewis Dot Structure?

Accepted Answer

$$8$$

Question 5

Which element is an exception to the Octet Rule and only requires $$2$$ valence electrons?

Accepted Answer

Hydrogen

Question 6

What is the correct Lewis Dot Structure for $$\mathrm{NH_4$^+} in $$terms of electron arrangement?

Accepted Answer

Nitrogen in the center with four single bonds to hydrogen, and no lone pairs on nitrogen

Question 7

When drawing the Lewis Dot Structure for $$\mathrm{O_2$^{2-}}$$, how many total valence electrons should be used?

Accepted Answer

$$14$$

Question 8

For the ion $$\mathrm{$$PCl_4$$^-}$$, what is the total number of valence electrons to be used in its Lewis Dot Structure?

Accepted Answer

$$5 + 4 	imes 7 + 1 = 34$$

Question 9

Which step in drawing a Lewis Dot Structure involves placing any remaining electrons on the central atom?

Accepted Answer

Step 4

Question 10

If a molecule has a negative charge, how does this affect the number of valence electrons used in its Lewis Dot Structure?

Accepted Answer

Add electrons equal to the charge

Question 11

Which of the following ions would require you to remove valence electrons from the double-bonded element when drawing its Lewis Dot Structure?

Accepted Answer

$$\mathrm{SCN^+}$$

Question 12

In the Lewis Dot Structure for $$\mathrm{SCN^+}$$, which atom is most likely to be placed in the center?

Accepted Answer

Carbon

Question 13

Which of the following is a correct application of the Octet Rule in a real-world scenario?

Accepted Answer

Oxygen in water ($$\mathrm{H_2O}) $$has two lone pairs and forms two single bonds with hydrogen

Question 14

Which step in the Lewis Dot Structure process involves following bonding preferences to determine atom connectivity?

Accepted Answer

Step 2

Question 15

How many lone pairs are present on the central atom in the Lewis Dot Structure for $$\mathrm{NH_4$^+}$$?

Accepted Answer

0

Question 16

Which of the following ions has a total of $$34$$ valence electrons in its Lewis Dot Structure?

Accepted Answer

$$\mathrm{$$PCl_4$$^-}$$

Question 17

When drawing the Lewis Dot Structure for $$\mathrm{O_2$^{2-}}$$, what is the correct arrangement of bonds between the two oxygen atoms?

Accepted Answer

Double bond with each oxygen having two lone pairs

Question 18

Which of the following is NOT a correct step in drawing a Lewis Dot Structure?

Accepted Answer

Ignore the charge of the ion when counting valence electrons

Question 19

In the Lewis Dot Structure for $$\mathrm{SCN^+}$$, how many total valence electrons are used?

Accepted Answer

$$15$$

Question 20

Which of the following ions would have the greatest number of valence electrons in its Lewis Dot Structure?

Accepted Answer

$$\mathrm{$$PCl_4$$^-}$$

Lewis Dot Structures for Ions: Step-by-Step Guide and Practice

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