Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Ch. 5 Worksheet Ch. 5-1 + 5-2 The Atom 1. What did Democritus contribute to the theory of atoms? ______________________________ ______________________________________________________________________________ 2. Two of the four parts of Dalton's Atomic Theory are incorrect. Rewrite the two incorrect statements so that they are true. a. ______________________________________________________________________ ______________________________________________________________________ b. ______________________________________________________________________ ______________________________________________________________________ 3. Describe the contributions to atomic theory made by Thomson's experiments with a cathode ray tube. ______________________________________________________________________________ ______________________________________________________________________________ and Rutherford's work with gold foil. ______________________________________________________________________________ ______________________________________________________________________________ 4. Describe the structure of the atom using complete sentences. The terms electron, proton, neutron, nucleus, mass, and charge should be included in your description (underline/highlight these words in your paragraph). ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ Ch.5.3 5. What is the atomic number of an element? _________________________________________ In an atom, how are the number of protons and electrons related? ______________________ How is the number of electrons related to the atomic number? _________________________ 6. What is the mass number of an atom? _____________________________________________ 7. For each diagram, list the atomic number and mass number. A periodic table can be used to find the symbol for each atom. Put a star on the isotopes. 1e 9e 7e 1e 6e 1p 9p 7p 1p 6p 10n 7n 1n 8n Atomic number 1 Mass number 1 Symbol H ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___ 8. The composition of an atom can be represented with a chemical symbol using a superscript and a subscript. Label the atomic number and mass number for the following chemical symbol. This element can also be represented as gold - _________ ___________197 ___________ 79 Au 9. Atoms that have the same number of ___________ but different numbers of ____________ are called _____________. Write the superscript/subscript chemical symbols for the two isotopes from question #7. ______________, _____________ 10. What is an atomic mass unit (amu)? _____________________________________________ ______________________________________________________________________________ 11. The atomic mass of an element is _______________________________________________ ______________________________________________________________________________ 12. Below is an element as represented on the Periodic Table. a. To the right label the atomic mass and atomic number. 3 b. Below state the number of protons, electrons, and Li neutrons found in this element. 6.941 p+_________ e- ________ n° ___________ c. Explain why the atomic masses for most elements are not whole numbers. ________________________________________________________________________ ________________________________________________________________________ Ch.5.4 Organizing the Elements 13. Who assembled the first periodic table? __________________________________________ 14. The modern periodic table is arranged according to increasing ________________________ 15. The horizontal rows are called _______________________. How many are there? ________ 16. The vertical columns are called ____________ or ______________. How do all of the elements in a vertical column compare? __________________________________________ 17. Name two elements that have properties similar to those of calcium. _______ and ________ 18. List four common properties of all elements that are metals. a. _______________________________________________ b. _______________________________________________ c. _______________________________________________ d. _______________________________________________ Use a periodic table to list the symbols of any five metals. ___________________________ 19. List four common properties of nonmetals. a. _______________________________________________ b. _______________________________________________ c. _______________________________________________ d. _______________________________________________ List the symbols of any five nonmetals. __________________________________________ 20. How do the properties of metalloids compare to those of metals and nonmetals? __________ ___________________________________________________________________________ Where are the metalloids found on the periodic table? _______________________________ List the symbols of all 7 metalloids. _____________________________________________ 21. How many elements are there? __________________