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

By the group number (A group)

Question 3

What is the correct Lewis dot symbol for the element Ti (Titanium)?

Accepted Answer

Ti with 2 dots

Question 4

When drawing a Lewis dot symbol, what do the dots around the element symbol represent?

Accepted Answer

Valence electrons

Question 5

Which element would have the following Lewis dot symbol: S with 6 dots?

Accepted Answer

Sulfur

Question 6

If an element is in group 5A, how many valence electrons does it have?

Accepted Answer

$$5$$

Question 7

Which of the following is the correct Lewis dot symbol for Phosphorus (P)?

Accepted Answer

P with 5 dots

Question 8

Why do transition metals often have unpredictable Lewis dot symbols?

Accepted Answer

They have variable numbers of valence electrons due to incomplete d subshells.

Question 9

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

Accepted Answer

They only show valence electrons.

Question 10

A student draws the Lewis dot symbol for Oxygen (O) as O with 4 dots. What is the error in this representation?

Accepted Answer

Oxygen should have 6 valence electrons, so 6 dots.

Question 11

Which element would have the following Lewis dot symbol: Cl with 7 dots?

Accepted Answer

Chlorine

Question 12

How many valence electrons does an element in group 2A have?

Accepted Answer

$$2$$

Question 13

Which of the following elements is most likely to form a stable ion by gaining one electron?

Accepted Answer

Br

Question 14

What is the significance of pairing dots when drawing Lewis dot symbols?

Accepted Answer

Paired dots represent electron pairs that are more stable.

Question 15

Which element would have the following Lewis dot symbol: N with 5 dots?

Accepted Answer

Nitrogen

Question 16

If an element has the electron configuration $$1s^2$$ $$2s^2$$ $$2p^5$$, how many valence electrons does it have?

Accepted Answer

$$7$$

Question 17

Which of the following elements is most likely to have a Lewis dot symbol with only one dot?

Accepted Answer

H

Question 18

A student draws the Lewis dot symbol for Sodium (Na) as Na with 7 dots. What is the error in this representation?

Accepted Answer

Sodium should have 1 valence electron, so 1 dot.

Question 19

Which element would have the following Lewis dot symbol: Mg with 2 dots?

Accepted Answer

Magnesium

Question 20

If an element is in group 7A, what is its most likely chemical behavior regarding electrons?

Accepted Answer

It tends to gain one electron to achieve a stable octet.

Lewis Dot Symbols and Valence Electrons

Study Guide - Practice Questions