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Across 4. The core of an atom that holds neutrons and protons. 7. Scientist who discovered the nucleus of an atom and protons. 8. The basic building blocks of an element. 9. A "ring" around a nucleus of an atom that has a certain number of electrons. 11. A subatomic particle within the nucleus that has no charge. 12. A subatomic particle within the atom that is negative charged. 13. Atomic mass rounded to the nearest whole number. 14. The region around the nucleus where electrons are. 17. That which has mass and occupies space. 18. An atom of a specific element with a varying amount of neutrons. 19. A positively charged subatomic particle within the nucleus.

Down 1. This person discovered the first atom. 2. The average mass of an atom of a particular element. 3. An isolated bright or dark line in a spectrum produced by emission or absorption of light of a single. 5. A pure substance distinguished by the amount of protons in the nucleus of one of its atoms. 6. The number of protons within an atom, represented by a number in the top-right corner of an elemenent key. 10. An atom or molecule where the total number of electrons is not equal to the total number of protons. 15. Scientist who believed an atom was positively charged an had negative charges inside it. 16. This person said electrons have specific amounts of energy and move in circular pathways around the nucleus at certain distances.es.