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Chapter 3
Term | Definition |
---|---|
nucleus | the dense, positively charged mass located in the center of an atom |
proton | a positively charged subatomic particle that is found in the nucleus of an atom |
electron | a negatively charged subatomic particle that is found in the space outside the nucleus of an atom |
neutron | neutral subatomic particle found in the nucleus of an atom |
atomic number | element equals the number of protons in an atom of that element |
mass number | sum of protons and neutrons in the nucleus of that atom |
isotopes | atoms of the same element that have different numbers if neutrons and different mass numbers |
energy levels | possible energies electrons have in an atom |
electron cloud | visual model of the most likely locations for electrons in an atom |
orbital | region of space around the nucleus where an electron is likely to be found |
electron configuration | arrangement of electrons in the orbitals of an atom |
ground state | when all the electrons in an atom have the lowest possible energies |