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Chapter 2 Vocab Quiz Element Compound Matter Trace Elements Atomic Nucleus Dalton Atom Neutron Electron Proton Mass Number Atomic Number Isotope Energy Potential Energy Electron Shell Valence Electron Orbital Molecule Structural Formula Cation Anion Ionic Bond Radioactive Isotope Chemical Bond Molecular Formula Electronegativity Nonpolar Polar Salts Hydrogen Bond Van der Waals Chemical Equilibrium 1. Define element: 2. The sum of the protons and neutrons is _______________. 3. The farther away from the nucleus of an atom the more ______________________ 4. What is the difference between an ionic and covalent bond? 5. Define Chemical Equilibrium. 6. What is matter? 7. Give the structural formula for H2O. Reactants Products 8. Define isotope. 9. Weak bonds that use the polarity of different molecules to increase adhesion. ___________________ 10. What is an electron on the outer most shell? ________________________ 11. Bonds that can be made and broken with relative ease. Useful in DNA replication. ___________________________________ 12. Define molecule. 13. Define what a salt is and an example of one. 14. Show three possible molecules created by CH4. 15. Write the chemical equation for photosynthesis (balanced) and label the products and the reactants. 16.