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The atom
Term | Definition |
---|---|
Atom | the smallest particle that still can be considered an element |
Electrons | negatively charged particles |
Nucleus | the center of an atom |
Proton | positively charged particles |
Energy level | The specific amount of energy an electron has |
Neutron | a particle with no charge |
Atomic number | the number of protons in the nucleus of an atom |
Isotopes | atoms with the same amount of protons and different amounts of neutrons |
Mass number | the sum of protons and neutrons in the atom |
Atomic mass | the average mass of all the isotopes in that element |
Periodic table | an arrangement of elements showing the repeating pattern of their properties |
Chemical symbol | the letter under an atomic number |
Periods | the rows in a periodic table |
Group | the elements in a collumn |