Electronegativity Trends and Concepts

This video tutorial by Ms. CM explores the concept of electronegativity, a measure of an atom's attraction for a bonding pair of electrons. It explains that electronegativity is measured on a relative scale, with fluorine being the most electronegative element and francium the least. The video discusses trends in electronegativity across a period, highlighting that values increase from left to right due to increasing nuclear charge. It also covers trends down a group, noting that electronegativity decreases as atomic radius increases and bonding electrons are further from the nucleus.

What does electronegativity measure?

• The attraction of an atom for a bonding pair of electrons

• The energy required to remove an electron

• The size of an atom

• The number of protons in an atom

Which element is the most electronegative?

• Oxygen

• Chlorine

• Fluorine

• Francium

What is the electronegativity value assigned to francium?

• 0.7

• 1.0

• 2.5

• 4.0

How does electronegativity change across a period?

• It remains constant

• It fluctuates

• It decreases

• It increases

Why does electronegativity increase across a period?

• Because the number of neutrons increases

• Because the nuclear charge increases

• Because the number of energy levels increases

• Because the atomic radius increases

What is the trend in electronegativity down a group?

• It remains constant

• It fluctuates

• It increases

• It decreases

Why does electronegativity decrease down a group?

• Because the atomic radius decreases

• Because the number of occupied energy levels increases

• Because the nuclear charge decreases

• Because the number of protons decreases

Which group is used as an example to explain the trend down a group?

• Group 17

• Group 2

• Group 18

• Group 1