Exploring Lewis Dot Structures

What is the primary purpose of Lewis dot structures?

• To show the atomic number of elements

• To indicate the melting point of elements

• To represent the valence electrons of elements

• To display the mass number of elements

How many valence electrons does oxygen have?

• 4

• 6

• 5

• 7

In a Lewis dot symbol, how are electrons positioned around the element symbol?

• Only on the left and right

• Randomly around the symbol

• Only on the top and bottom

• On four sides: top, bottom, left, and right

What does a single line represent in a Lewis dot structure for compounds?

• A single bond

• A lone pair of electrons

• A triple bond

• A double bond

How many electrons are involved in a double bond?

• 6

• 2

• 8

• 4

Which element is usually placed in the center of a Lewis dot structure for compounds?

• The element with the highest electronegativity

• The element with the lowest electronegativity

• Hydrogen

• The element with the most valence electrons

How many valence electrons are there in a molecule of NF3?

• 24

• 26

• 28

• 30

What is unique about hydrogen in Lewis dot structures?

• It always forms two bonds

• It never forms bonds

• It only needs two electrons to have a full shell

• It always goes in the center

How many valence electrons does boron need to be stable?

• 2

• 4

• 6

• 8

What is an expanded octet?

• When an element has no electrons

• When an element has exactly 8 electrons

• When an element has less than 8 electrons

• When an element has more than 8 electrons