Valence Electrons and Octet Rule

The video tutorial explains how to write the Lewis structure for sulfur hexachloride (SCl6). It begins by counting the valence electrons, noting that sulfur has 6 and each chlorine has 7, totaling 48 valence electrons. The least electronegative atom, sulfur, is placed in the center with six chlorines around it. The video highlights that sulfur can have an expanded octet, allowing it to hold more than eight electrons. The tutorial concludes by ensuring all valence electrons are used, resulting in the correct Lewis structure for SCl6.

How many valence electrons are there in total for the SCl6 molecule?

• 48

• 54

• 42

• 36

Which atom is placed at the center of the SCl6 Lewis structure?

• Chlorine

• Sulfur

• Oxygen

• Hydrogen

How many chlorine atoms are arranged around the sulfur atom in the SCl6 structure?

• 7

• 6

• 5

• 4

Why is sulfur an exception to the octet rule in the SCl6 molecule?

• It has more protons than electrons.

• It is in period two of the periodic table.

• It is in period three and can have an expanded octet.

• It can only form single bonds.

What is the total number of valence electrons used around the sulfur atom in SCl6?

• 8

• 10

• 14

• 12

What is the significance of period three elements in the context of the octet rule?

• They have fewer electrons than protons.

• They can have an expanded octet.

• They cannot form double bonds.

• They are always the most electronegative.

How many valence electrons does each chlorine atom have in the SCl6 structure?

• 7

• 6

• 8

• 9

What confirms the correctness of the SCl6 Lewis structure?

• All atoms have 6 valence electrons.

• All 48 valence electrons are used.

• Sulfur is the most electronegative.

• Chlorine atoms are in the center.