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Download Chapter 4- Studying Atoms, Atomic Theory, and Structure of an Atom
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Chapter 4- Studying Atoms, Atomic Theory, and Structure of an Atom (27 pts total) 1. Fill in the table with the correct information (6 points) Atomic Models Scientist Description Sketch of model Atoms are like solid spheres. Quic kTime™ and a dec ompres sor are needed to see this pic ture. Thomson Rutherford All of the atom’s positive charge is concentrated in its nucleus Bohr Chp 4.1- Read each Question Carefully (1 pt each) 2. Democritus named the smallest particles of matter ______________________________ 3. List the four elements that Aristotle included in his model of matter. a. ____________________ c. ____________________ b. ____________________ d. ____________________ 4. Circle the letters of the sentences that represent the main points of Dalton’s theory of atoms a. All elements are composed of atoms b. In a particular compound, atoms of different elements always combine the same way. c. All atoms have the same mass d. Compounds contain atoms of more than one element 5. Is the following true or false? Thomson’s experiments provided the first evidence for the existence of subatomic particles. _______________________ 6. Circle the letters of the sentences that states what Rutherford concluded from the gold foil experiment. a. An atom’s negative charge is concentrated in its nucleus b. Thomson’s model of the atom was correct c. An atom’s positive charge is concentrated in its nucleus d. An atom’s positive charge is spread evenly throughout the atom Chp 4.3- Read each Question Carefully (1 pt each) 7. Circle the letter of the sentence that tells how Bohr’s model of the atom differed from Rutherford’s model a. Bohr’s model focused on the c. Bohr’s model focused on the nucleus neutrons b. Bohr’s model focused on the d. Bohr’s model focused on the protons electrons 8. Is the following true or false? In Bohr’s model of the atom, electrons have a constant speed and move in fixed orbits around the nucleus. _____________________ 9. What can happen to an electron in an atom when the atom gains or loses energy? __________ ___________________________________________________________________________ 10. Is the following true or false? When electrons release energy, some of the energy may be released as visible light. _____________________ 11. What is an electron cloud? _____________________________________________________ ___________________________________________________________________________ 12. Is the following true or false? An Orbital is a region of space around the nucleus where an electron is likely to be found. ____________________ 13. Higher energy levels have ________________________ orbitals than lower energy levels do. 14. What is the relationship between the number of orbitals and the maximum number of electrons in an energy level? ____________________________________________________ ___________________________________________________________________________ 15. Circle the letters of each sentence that is true when all of the electrons in an atom are in orbitals with the lowest possible energies. a. The electrons are in the most c. The atom is in an excited state stable configuration d. The atom is in its ground state b. The electrons are in an unstable configuration Chp 4.2- Read each Question Carefully (1 pt each) 16. What are three subatomic particles? a. ___________ b. ___________ c. ___________ 17. Circle the letter that identifies a subatomic particle with a positive charge a. Nucleus c. Neutron b. Proton d. Electron 18. Circle the letters of properties that vary among subatomic particles a. Color c. Charge b. Mass d. Location in the atom 19. Circle the letter of the expression that accurately compares the masses of neutrons and protons a. Mass of 1 neutron = mass of 1 proton b. Mass of 2000 neutrons = mass of 1 proton c. Mass of 1 electron = mass of 1 proton d. Mass of 1 neutron = mass of 1 electron 20. Is the following true or false? Two atoms of the same element can have different numbers of protons. ____________________ 21. What is an atomic number? _____________________________________________________ ___________________________________________________________________________ 22. What is the mass number of an atom? ____________________________________________ ___________________________________________________________________________ 23. Complete the equation below to find the number of neutrons in an atom a. Number of neutrons = ______________________ - __________________________ 24. Every atom of a given element has the same number of ________________________ and ________________________ 25. What are isotopes? ___________________________________________________________ ___________________________________________________________________________ ___________________________________________________________________________ 26. All oxygen atoms have 8 protons. Circle the letter of the number of neutrons in an atom of oxygen-18 a. 8 c. 10 b. 9 d. 18 27. Water that contains hydrogen-2 atoms instead of hydrogen-1 atoms is called _________________________.
