Atomic Number and Mass

Atomic Number and Mass

1. Isotopes: different atomic forms of the same element

   • Same number of protons and electrons, different number of neutrons and mass
     • an example is Carbon-12 and Carbon-14, which are both types of carbon, but they have a different mass

2. The Nucleus

   • has both protons and neutrons
     • positive charge because of the proton
       • Most of the atom's mass is here

3. Electrons

   • around the nucleus
     • tiny but use a great deal of space

4. What is an ion?

   • when electrons are added or removed
     • Atom is then charged