$$ \text{(ns electrons)} + \text{(n-1)d electrons} $$

Question 1

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

Accepted Answer

Bromine (Br)

Question 2

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

Accepted Answer

By the group number (for groups 1A-8A)

Question 3

Which of the following is the correct Lewis Dot Symbol for sulfur (S)?

Accepted Answer

$$ \mathrm{S} \cdot \cdot \cdot \cdot \cdot \cdot $$

Question 4

When drawing Lewis Dot Symbols, what do the dots around the element symbol represent?

Accepted Answer

Valence electrons

Question 5

How many valence electrons does a neutral oxygen atom have?

Accepted Answer

6

Question 6

Which step is NOT part of the process for drawing a Lewis Dot Symbol for an element?

Accepted Answer

Arranging electrons according to atomic mass

Question 7

For transition metals, the number of valence electrons is calculated as:

Accepted Answer

$$ 	ext{(ns electrons)} + 	ext{(n-1)d electrons} $$

Question 8

If you are given the ion $$ \mathrm{Cl}^{-} $$, how would you represent its Lewis Dot Symbol?

Accepted Answer

$$ [\mathrm{Cl} \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot]^{-} $$

Question 9

Which element would have the following Lewis Dot Symbol: $$ \mathrm{X} \cdot \cdot \cdot \cdot \cdot \cdot \cdot $$ ?

Accepted Answer

Fluorine (F)

Question 10

A calcium ion $$ \mathrm{Ca}^{2+}  is $$formed by:

Accepted Answer

Removing two electrons from calcium

Question 11

Which of the following statements about Lewis Dot Symbols is correct?

Accepted Answer

They only represent the valence electrons

Question 12

When drawing the Lewis Dot Symbol for tellurium (Te), how many dots should be placed around the symbol?

Accepted Answer

6

Question 13

Which of the following elements is a transition metal?

Accepted Answer

Iron (Fe)

Question 14

If an atom forms a cation, what happens to its Lewis Dot Symbol?

Accepted Answer

Electrons are removed

Question 15

Which element in period 2 has the most valence electrons?

Accepted Answer

Neon (Ne)

Question 16

What is the correct order for placing electrons when drawing a Lewis Dot Symbol?

Accepted Answer

Start from the top and move clockwise

Question 17

Which of the following ions would have eight dots in its Lewis Dot Symbol?

Accepted Answer

$$ \mathrm{O}^{2-} $$

Question 18

A student draws the Lewis Dot Symbol for aluminum (Al) as $$ \mathrm{Al} \cdot \cdot \cdot \cdot . $$What is the error?

Accepted Answer

Aluminum should have 3 dots

Question 19

Which element would have the following electron configuration for its valence electrons: $$ 4s^2$ 3d^6$ $$?

Accepted Answer

Iron (Fe)

Question 20

Why do noble gases have a full set of dots in their Lewis Dot Symbols?

Accepted Answer

They have a full valence shell

Lewis Dot Symbols and Valence Electrons

Study Guide - Practice Questions