Question 1

Which of the following elements has the greatest number of valence electrons?

Accepted Answer

Br

Question 2

For a main group element, how do you determine the number of valence electrons?

Accepted Answer

It is equal to the group number (for groups 1A-8A).

Question 3

Which of the following is the correct Lewis dot symbol for a neutral oxygen atom?

Accepted Answer

$$\mathrm{O}$$ with 6 dots around it

Question 4

How many valence electrons does a neutral calcium atom have?

Accepted Answer

2

Question 5

When drawing a Lewis dot symbol for a main group element, what do the dots represent?

Accepted Answer

Valence electrons

Question 6

Which of the following correctly describes the process for drawing a Lewis dot symbol for an anion?

Accepted Answer

Add electrons and place the symbol in brackets with a negative charge

Question 7

A student draws the Lewis dot symbol for $$\mathrm{Na^+} as$$ $$[\mathrm{Na}]^+$$ with one dot. What is the error in this representation?

Accepted Answer

There should be no dots.

Question 8

Which of the following transition metals has the greatest number of valence electrons according to the rules provided?

Accepted Answer

Cu

Question 9

If you are given the ion $$\mathrm{Cl^-}$$, how many dots should be placed around the symbol in its Lewis dot structure?

Accepted Answer

8

Question 10

Which of the following best explains why noble gases are generally unreactive in terms of their Lewis dot symbols?

Accepted Answer

They have a full set of valence electrons (8 dots).

Question 11

A student is asked to draw the Lewis dot symbol for tellurium (Te). Which of the following is the correct number of dots to use?

Accepted Answer

6

Question 12

Which of the following statements about Lewis dot symbols is correct?

Accepted Answer

The element symbol represents the nucleus and core electrons.

Question 13

When drawing Lewis dot symbols, what is the correct order for placing the first four electrons?

Accepted Answer

One on each side before pairing

Question 14

Which of the following ions would have the same Lewis dot structure as neon?

Accepted Answer

$$\mathrm{F^-}$$

Question 15

A transition metal ion has the electron configuration $$[\mathrm{Ar}]\ 4s^1$\ 3d$$^{10}$$. How many valence electrons does it have according to the rules provided?

Accepted Answer

11

Question 16

Which of the following best describes the difference in drawing Lewis dot symbols for cations and anions?

Accepted Answer

Cations have fewer dots and anions have more dots than the neutral atom.

Question 17

Which of the following is the correct Lewis dot symbol for $$\mathrm{Mg$$^{2+}$$}$$?

Accepted Answer

$$[\mathrm{Mg}]^{2+}$$ with no dots

Question 18

A student is asked to draw the Lewis dot symbol for $$\mathrm{P$$^{3-}$$}. $$How many dots should be placed around the symbol?

Accepted Answer

8

Question 19

Which of the following best explains why the Lewis dot symbol for $$\mathrm{K^+}$$ has no dots?

Accepted Answer

Potassium loses its single valence electron to form $$\mathrm{K^+}$$, leaving no valence electrons.

Question 20

Which of the following is the correct Lewis dot symbol for $$\mathrm{S$$^{2-}$$}$$?

Accepted Answer

$$[\mathrm{S}]^{2-}$$ with 8 dots

Lewis Dot Symbols and Valence Electrons: Chemical Bonding Fundamentals

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