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Atom
| Term | Definition |
|---|---|
| Atom | Smallest particle that still can be considered an element |
| Electrons | charged particles |
| Nucleus | the central and most important part of an object, movement, or group, forming the basis for its activity and growth. |
| Protons | positively charged particles in an atoms nucleus |
| Atomic Number | the number of protons in the nucleus of an atom |
| isotopes | Atoms with the same number of protons and neutrons |
| Mass number | an isotope is identified by a mass number |
| atomic mass | element that is averaged mass of all the isotopes of that element |
| periodic table | an arrangement of elements showing the repeating pattern of their properties |
| chemical symbol | below the atomic number is a letter |
| periods | the periodic table is arranged in rows , period contains a seriou of different numbers |
| group | the elements in a column form a group |
| Metals | elements that are good conductors of electric current and heat |