Valence Electrons and Lewis Structures

The video tutorial explains how to write the Lewis structure for arsenic by first determining the number of valence electrons using the periodic table. Arsenic is in group 15, indicating it has five valence electrons. The video also covers arsenic's electron configuration, confirming the valence electron count. Dr. B concludes with a summary of the findings.

What is the first step in writing the Lewis structure for an element?

• Locate the element in the transition metals

• Determine the number of protons

• Identify the atomic mass

• Find the number of valence electrons

How many valence electrons do elements in group 15 have?

• 3

• 5

• 7

• 8

Where is arsenic located on the periodic table?

• Group 14

• Group 15

• Group 16

• Group 13

What does the Lewis structure for arsenic show?

• The arrangement of valence electrons

• The atomic mass

• The electron configuration

• The number of protons

How many valence electrons are placed around the symbol for arsenic in its Lewis structure?

• 5

• 4

• 6

• 3

What is the atomic number of arsenic?

• 32

• 31

• 34

• 33

Which energy level contains the valence electrons for arsenic?

• Fifth

• Fourth

• Third

• Second