Valence Electrons and Lewis Dot

What is the highest energy level seen in this diagram for Na (sodium)?

• 3

• 2

• 1

According to the diagram, how many valence electrons does sodium have?

• 1

• 8

• 2

True or False: All elements in Group 1A have 1 valence electron. 

• True

• False

How many valence electrons do elements in group 3A have?

• 3

• 13

All elements in Group 8A have 8 valence electrons... except for Helium, which has ____ .

• 2 valence electrons

• 24 valence electrons

How does the narrator know that oxygen has 6 valence electrons?

• Oxygen is in group 6A on the periodic table.

• Oxygen has a mass of 6 amu.

• The narrator just memorized this.

True/False: all sides of the symbol need to have at least one electron before you can "double up" and put a second electron dot on that side.

• True

• False

Use a periodic table to answer the following question. How many dots should nitrogen have in its Lewis dot diagram?

• 5

• 7

• 14

Use a periodic table to answer the following question. How many electron dots should fluorine have in its Lewis dot diagram?

• 7

• 9

• 18

How many valence electrons do most atoms "want"?

• a full shell -- 8 electrons

• a full shell -- 2 electrons

• they do not need any additional electrons