1.7 ; ions, atoms, and isotopes

What is an ion?

Atoms that [gain/lose] electrons form negative ions. If atoms [gain/lose] electrons they form positive ions.

What is the scientific name for:
a) negatively charged ions
b) positively charged ions

True or False:

Atoms of the same elements can never have a different amount of neutrons.

For example, two isotopes of carbon are carbon-12 and carbon-13.

Isotopes have similar [chemical/physical] properties, but their [chemical/physical] properties, such as density, can differ.