| A | B |
|---|
| Element | A substance that contains only one kind of atom and can not be physically broken down |
| Atom | The building block of matter or the simplest form of matter. |
| Proton | A positively charged particle in an atom found in the nucleus. |
| Neutron | A particle of an atom that is assigned NO charge and is found in the nucleus. |
| Electron | A negatively charged particle in an atom that can be found orbiting the nucleus. |
| Nucleus | The area of the atom where the protons and neutrons are found. It contains practically all the mass of the atom. |
| Isotope | An atom of a given element that has a DIFFERENT number of neutrons than protons (more of less neutrons) |
| Ion | A positively or negatively charged atom (it has gained or lost electrons) |
| Atomic Number | Determined by the number of protons (the same as the number of protons). |
| Mass Number | The total of the mass of the protons and the mass of the neutrons (usually a whole number about double the number of protons) |
| Atomic Mass | The average of all the known masses of the isotopes for a given element (usually a whole number and a decimal) |
| Given an atom, how do you know which element it is? | Atoms are identified by the number of protons they have. |
| Where is most of the mass in an atom? | In the nucleus |
| What to particles in the atom make most of the mass? | The protons and the neutrons |
| What is the lightest part of an atom? | The electrons |
| What are the 4 basic forces that hold atoms together? | GEWS 1) Gravitational 2) Electromagnetic 3) Weak 4) Strong |
| What is the same as the number of protons? | The number of electrons and the atomic number |
| Where do you find electrons? | in energy levels around the nucleus or the electron cloud |
| True or False... Each energy level holds a certain number of electrons. | True |
| What kind of a charge do STABLE atoms have? | They have a NEUTRAL charge |
