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The formula for sodium sulfide is na2s what does it mean


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1. Mendeleev's periodic table of elements was organized by A. mass B. atomic number C. number of electrons D. number of protons 2. Compared with Group 6A elements, Group 2A elements have A. more atoms in the ground state. B. more valence electrons. C. more isotopes. D. fewer valence electrons. 3. Which element is found in most of the compounds in your body except for water? A. iodine B. potassium C. iron D. carbon 4. Which of the following Group 1A elements is the least reactive? A. Cs (cesium) B. Li (lithium) C. K (potassium) D. Na (sodium) 5. To keep them from reacting, some highly reactive elements are stored in A. water. B. pure oxygen. C. liquid mercury. D. argon. 6. The tendency of an element to react is closely related to A. its atomic mass. B. attractions between its atoms. C. the number of valence electrons in atoms of the element. D. the ratio of protons to neutrons in atoms of the element. 7. The usefulness of Mendeleev’s periodic table was confirmed by A. the discovery of subatomic particles. B. its immediate acceptance by other scientists. C. the discovery of elements with predicted properties. D. the discovery of the nucleus. 8. Group 8A of the periodic table contains the A. least reactive metals. B. most reactive metals. C. least reactive nonmetals. D. most reactive nonmetals. 9. One twelfth the mass of a carbon-12 atom is used to define a(an) A. atomic mass unit. B. atomic mass. C. mass number. D. atomic number. 10. Atoms of the least reactive elements tend to have A. one or seven valence electrons. B. eight valence electrons. C. four or five valence electrons. D. no valence electrons.

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