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Across 1. a difference in _____________is used to separate a mixture. 11. all elements in a vertical column have similar 14. the three subatomic particles. 16. Rutherford's famous experiment 18. the smallest part of an element that retains its identity 21. _____________________physical properties depend only on the type of matter. 22. Dalton said atoms of different atoms combine in ___________________ratios to form compounds. 23. 1/1800 the mass of a proton 24. ___________properties can be observed without destroying a substance. 25. Rutherford's nuclear model did not account for this 27. vertical columns are called 29. __________________discovered the electron. 31. protons plus neutrons 32. first suggested that atoms exist 33. Rutherford discovered that atoms have a ___________ 34. Dalton viewed atoms as ______________ 35. two or more substances physically blended

Down 2. says that in any chemical reaction the mass of the reactants and products must be the same 3. contains only one type of atoms 4. Atoms are mostly ________________ 5. a ____________can be separated chemically into its elements. 5. made of two or more elements 6. determined the mass of the electron 7. not uniform throughout 8. arranges elements in order of increasing atomic number 9. these have about the same mass 10. Proposed the first scientific model of the atom. 12. The number of protons in the nucleus of an atom is called the 13. In a neutral atom the number of _________________equals the number of ____________________. 15. alpha particles are 17. producing a gas, color change, emitting heat or light, 19. Thomson's model of the atom 20. Observing a ____________________property always changes a substance into a new substance. 24. horizontal rows are called 26. ________________physical properties depend only on the amount of matter. 28. same element with different numbers of neutrons 30. a homogenous mixture is also know as a _______.