Trends in electronegativity can make it hard to guess how chemicals will react with each other.

1. Problems:

• Different patterns in elements can cause unexpected ways they bond.
• It's tough to figure out if molecules are polar (having distinct positive and negative sides) or nonpolar (evenly balanced).
• If we misunderstand how strong the bonds are, we might get the wrong ideas about reactions.

2. Possible Solutions:

• Learn how electronegativity works: it goes up as you move across the periodic table and goes down as you go down the table.
• Use the Pauling scale to compare electronegativity values.
• Practice with examples to better understand how bonds work.

To tackle these challenges, it’s important to study well and regularly apply what you've learned.