Valence Electrons and Lewis Structures

The video tutorial explains how to draw the Lewis structure for the tetrafluoroammonium cation (NF4+). It begins by counting the valence electrons of nitrogen and fluorine, accounting for the positive charge by subtracting an electron. The tutorial then guides viewers through placing the least electronegative atom, nitrogen, at the center and arranging fluorine atoms around it. Electrons are placed between atoms to form bonds, and octets are completed for each atom. The final structure is bracketed to indicate its ionic nature, and a positive sign is added outside the brackets.

What is the group number of nitrogen in the periodic table?

• Group 17

• Group 16

• Group 15

• Group 14

How many valence electrons does a single fluorine atom have?

• 7

• 8

• 6

• 5

What is the total number of valence electrons in NF4+?

• 32

• 31

• 30

• 33

Which atom is placed at the center of the NF4+ Lewis structure?

• Hydrogen

• Oxygen

• Nitrogen

• Fluorine

How many chemical bonds are formed between nitrogen and fluorine in NF4+?

• 2

• 5

• 3

• 4

What is the total number of valence electrons used in the NF4+ Lewis structure?

• 34

• 32

• 30

• 28

Why are brackets used in the Lewis structure of NF4+?

• To separate different atoms

• To show it is an ion

• To highlight the central atom

• To indicate a molecule

What charge is placed outside the brackets in the NF4+ Lewis structure?

• Negative

• Neutral

• Positive

• Double positive