Oxidation Numbers and Periodic Trends

The video tutorial explains how to find the oxidation numbers for each element in potassium fluoride (KF). It begins by noting that KF is a neutral compound, meaning the sum of oxidation numbers equals zero. Potassium, being in group one of the periodic table, has an oxidation number of +1. Fluorine, the most electronegative element, always has an oxidation number of -1. The video concludes by verifying that the sum of these oxidation numbers equals zero, confirming KF as a neutral compound.

What is the oxidation number of a neutral compound?

• It is zero.

• It varies depending on the compound.

• It is always negative.

• It is always positive.

Which group on the periodic table does potassium belong to?

• Group 2

• Group 1

• Group 17

• Group 18

What is the oxidation number of potassium in compounds?

• -1

• 0

• +1

• +2

Why does fluorine have a consistent oxidation number?

• It is the most electronegative element.

• It is the least electronegative element.

• It is a noble gas.

• It is a metal.

What is the oxidation number of fluorine in compounds?

• +1

• +2

• 0

• -1

How do the oxidation numbers of potassium and fluorine in KF add up?

• They add up to +1.

• They add up to -2.

• They add up to 0.

• They add up to +2.