Describe the properties of atoms, ions, and molecules

Atoms are the smallest unit of matter that can't be broken down chemically. Molecules are groups of two or more atoms that are chemically bonded. Ions are atoms or molecules that have gained or lost one or more of their valence electrons and therefore have a net positive or negative charge.

wrapping the coil around a piece of iron (such as an iron nail)

adding more turns to the coil

increasing the current flowing through the coil