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The eighth grade unit learning guidance and evaluation answers Zhejiang Education Press
Computer schematic diagram of direct observation chart II. Symbolic shape language iii. Dalton 4. The negative 10 power of the chemical properties of atoms is understandable. 6. Thomson electrons are positively charged, just like raisins in bread. 7. Rutherford nucleus is positively charged.

8. Proton neutrons have no quarks. 9. The nuclear toll number is 10. The nuclear charge number is 1 1. The proton neutron isotope is 12. The negative ion is 13. Iron atom, water molecule, sodium ion and chloride ion are 14. Pure substances of the same element have pure substances of different elements.

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.21metallic solid nonmetallic gas 22 C > b > A 23 hydrogen chemical molecules are decomposed into atoms, and the atomic composition molecules are 24134 562 26 567124 3.