TWC 0.04 – Recap

Recap

• Atoms can join together as molecules by forming covalent bonds.
• Covalent bonds are formed when atoms share an electron.
• Another way for atoms to bond is through ionic bonding.
• Ionic bonding occurs when one atom steals an electron from another atom.
• Electrons have a negative charge, so when one is stolen, the thieving atom acquires a negative charge and is called an anion.
• The atom that is stolen from acquires a positive charge and is called a cation.
• Rainfall encounters carbon dioxide and dissolves it, which makes the water acidic.
• Acidic water is able to dissolve mineral salts as it percolates through the bedrock.