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Download Development of Atomic Theory - Phillips Scientific Methods
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Name_____________________________ Period ___ Date ___/___/___ 2 Atomic Structure & Nuclear Chemistry D EV E L O P ME N T O F T HE A T O M IC T H EO R Y Directions: Fill in the blanks on the right with the information in the word list below. Word List atom atomic number Chadwick conservation of matter Dalton definite proportions electron Goldstein isotopes mass number neutron nucleus proton Rutherford subatomic particle Thomson More than 2000 years ago, Greek philosophers proposed the existence 1. ___________________ of very small, indivisible particles, each of which was called a(n) 2. ___________________ __(1)__. The theory that such particles existed was supported, much later, by Lavoisier, who proposed, in his law of __(2)__, that matter cannot be created or destroyed. Then Proust proposed, in his law of 3. ___________________ 4. ___________________ __(3)__, that the ratio of the masses of elements in any given 5. ___________________ compound is always the same. An atomic theory based on these laws 6. ___________________ was developed by __(4)__. 7. ___________________ It was later proposed that the atom was not indivisible, but is made up of smaller particles, each of which is called a(n) __(5)__. These particles include the negatively-charged __(6)__, discovered by 8. ___________________ 9. ___________________ 10. ___________________ __(7)__; the positively-charged __(8)__, discovered by __(9)__; and the 11. ___________________ uncharged __(10)__, discovered by __(11)__. The latter two particles are present in the __(12)__, or center, of the atom, which was discovered by __(13)__ in his gold foil experiment. 12. ___________________ 13. ___________________ 14. ___________________ The number of positively-charged particles in an atom is called its 15. ___________________ __(14)__. The sum of the positively-charged particles and the 16. ___________________ uncharged particles is called the __(15)__ of the atom. Atoms that have the same number of positively-charged particles but different numbers of uncharged particles are called __(16)__. [Type here]
