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Foundations of Matter Worksheet #2 - KEY Matching __G___ 1. neutron A. Matter made of only one kind of atom __D___ 2. atom B. What is formed when atoms combine by sharing electrons C. Positive electric charge within the nucleus of the atom D. Tiny part that makes up matter __A___ 3. element __B___ 4. molecule E. Letter or letters; used to represent elements F. What all things are made of; it occupies space G. An uncharged particle within the nucleus of an atom H. Tiny negative electrical charges that move around the nucleus of an atom I. An atom that has lost or gained electrons __L___ 5. formula __C___ 6. proton __F___ 7. matter __E___ 8. symbol __I___ 9. ion __H___ 10. electrons __K___ 11. isotope __N___ 12. atomic number __J___ 13. periodic table __M___ 14. mass number J. Chart that shows all of the elements classified by similar properties K. Form of an element with different numbers of neutrons L. Symbols put together to show the elements in a compound M. Number of protons and neutrons in the nucleus of an atom N. Number of protons in an atom How many of each element makes up the following substances. 15. H2SO4 16. C6H12O6 17. KOH 18. NH4NO3 19. K2Cr2O7 20. Ba(NO3)2 Hydrogen 2 _____________ carbon 6 _____________ sulfur 1 _____________ hydrogen 12 _____________ oxygen 4 _____________ oxygen 6 _____________ potassium 1 _____________ nitrogen 2 _____________ oxygen 1 _____________ hydrogen 4 _____________ hydrogen 1 _____________ oxygen 3 _____________ potassium 2 _____________ barium 1 _____________ chromium 2 _____________ nitrogen 2 _____________ oxygen 7 _____________ oxygen 6 _____________ Complete the following table. Element Symbol Atomic number 109 Silver 47 47 Mass number Protons Neutrons Electrons 109 47 62 47 79 199 79 120 79 78 195 78 117 78 29 61 29 32 29 Ag GOLD 199 79 Platinum COPPER Au 195 78 61 29 Pt Cu Magic Square(½ point/box, min 6) Directions: Put the number of the definition from the list below into the square with the appropriate term. Check your answers by adding the numbers to see if all the sums of all rows, both across and down add up to the same number, the Magic #. 1. Represented by a symbol; all are found on the Periodic Table 2. Made a mental model of the atom; Greek philosopher 3. Used by Rutherford in his experiment; made of two protons and two neutrons 4. The paths in which electrons circle the nucleus according to the Bohr model 5. The positive particle in the nucleus of an atom 6. The tiny positive core of an atom; contains protons and neutrons 7. Formed the atomic theory model of the atom; English schoolteacher 8. Discovered the nucleus using his gold foil experiment 9. Name of Millikan’s experiment 10. Used by scientists to explain something we are unable to see or understand 11. The smallest particle of an element that has the properties of that element 12. Discovered the neutron 13. Current model of the atom; combining theories proposed by Heisenberg, Schrodinger and de Broglie 14. Mass of protons and neutrons 15. Developed the model of the atom in which electrons orbit the nucleus in energy levels 16. The negative particle that circles the nucleus 17. The neutral particle in the nucleus of an atom 18. Proposed the “plum-pudding” model of the atom; discovered the electron Democritus 2 Dalton 7 Thomson 18___ Chadwick 12___ __ ___ Rutherford __ ___ Proton __ __ ___ Quantum Mechanical __ ___ Neutron __ ___ Nucleus __ ___ Alpha particle __ ___ Energy levels __ ___ Oil Drop 8 13 __ ___ Electron 16__ __ Total __39__ 5 17___ __ Model 10____ __ __39___ Atom 11 6 4___ __ Bohr Total __39___ 15 __39___ 3 __39___ 9___ __39___ __ __ __39___ __39____ 39