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Across 4. a visual model of the most likely locations for the electrons in an atom 7. a state in which all the electrons in an atom have the lowest possible energies 11. the possible energies that electrons in an atom can have 12. a negatively charged subatomic particle that is found in the space outside the nucleus of an atom

Down 1. the arrangement of electrons in the orbitals of an atom 2. a positively charged subatomic particle that is found in the nucleus of an atom 3. a unique number for each element that equals the number of protons in an atom of that element 5. atoms of a given element that have different numbers of neutrons and different mass numbers 6. a neutral subatomic particle that is found in the nucleus of an atom 8. the sum of the number of protons and neutrons in the nucleus of an atom 9. the dense, positively charged mass located in the center of an atom 10. a region of space around the nucleus where an electron is likely to be found