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Chapter 4 Vocab
Term | Definition |
---|---|
Nucleus | A dense, positively charged mass located in the center of the 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. |
Neutron | A neutral subatomic particle that is found in the nucleus of an atom. |
Atomic number | An element equals the number of protons in an atom of that element. |
Mass number | The sum of the protons and neutrons in the nucleus of that atom. |
Isotopes | Atoms of the same element that have different numbers of neutrons and different mass numbers. |
Energy levels | The possible energies that electrons in a atom can have. |
Electron cloud | A visual model of the most likely locations for electrons move in an atom. |
Orbital | A region of space around the nucleus where an electron is likely to be found. |
Electron configuration | The arrangement of electrons in the orbitals of an atom. |
Ground state | When all the electrons in an atom have the lowest possible energies. |