Lewis Structures and Valence Electrons

The video tutorial explains how to write the Lewis structure for PBr4+. It begins by calculating the total number of valence electrons, considering the positive charge indicating a loss of one electron. Phosphorus is placed at the center due to its lower electronegativity, surrounded by bromine atoms. The tutorial ensures all atoms achieve octets using the available 32 valence electrons. Finally, the structure is enclosed in brackets to denote its ionic nature, with a plus sign indicating the charge.

What is the first step in writing the Lewis structure for PBr4+?

• Determine the number of valence electrons

• Draw the molecular shape

• Identify the central atom

• Calculate the molecular weight

How many valence electrons does phosphorus have?

• 3

• 8

• 5

• 7

In which group is bromine found on the periodic table?

• Group 8A

• Group 7A

• Group 6A

• Group 5A

What does the positive charge in PBr4+ indicate?

• Loss of an electron

• Loss of a proton

• Gain of an electron

• Gain of a proton

How many total valence electrons are there in PBr4+?

• 30

• 31

• 32

• 33

Which atom is placed at the center of the PBr4+ structure?

• Bromine

• Oxygen

• Hydrogen

• Phosphorus

What is the purpose of placing electrons between atoms in the Lewis structure?

• To balance the equation

• To form chemical bonds

• To increase atomic mass

• To change the element

What must be completed around each bromine atom in the structure?

• An octet

• A quartet

• A triplet

• A duet

Why are brackets added to the Lewis structure of PBr4+?

• To show it is an ion

• To denote the charge

• To indicate it is a molecule

• To highlight the central atom

What is the final step in completing the Lewis structure for PBr4+?

• Adding brackets and charge

• Rearranging atoms

• Changing the central atom

• Adding more electrons