1. WHSAD Mr. Quinn and Ms. Tom 10/25/13

2.  An orbital is defined as a region of the most probable location of 1. an electron 2. a neutron 3. a nucleus 4. a proton

3.  Which phrase describes an atom? 1. a positively charged electron cloud surrounding a positively charged nucleus 2. a positively charged electron cloud surrounding a negatively charged nucleus 3. a negatively charged electron cloud surrounding a positively charged nucleus 4. a negatively charged electron cloud surrounding a negatively charged nucleus

4.  Which statement best describes gamma radiation? 1. It has a mass of 1 and a charge of 1. 2. It has a mass of 0 and a charge of –1. 3. It has a mass of 0 and a charge of 0. 4. It has a mass of 4 and a charge of +2.

5.  Which statement about one atom of an element identifies the element? 1. The atom has 1 proton. 2. The atom has 2 neutrons. 3. The sum of the number of protons and neutrons in the atom is 3. 4. The difference between the number of neutrons and protons in the atom is 1.

6.  Which elements are present in this mixture? 1. E and D, only 2. E and G, only 3. D and G, only 4. D, E, and G

7.  Which group of atomic models is listed in historical order from the earliest to the most recent? 1. hard-sphere model, wave-mechanical model, electron-shell model 2. hard-sphere model, electron-shell model, wave-mechanical model 3. electron-shell model, wave-mechanical model, hard-sphere model 4. electron-shell model, hard-sphere model, wave-mechanical model

8.  Radiation is spontaneously emitted from hydrogen-3 nuclei, but radiation is not spontaneously emitted from hydrogen-1 nuclei or hydrogen-2 nuclei. Which hydrogen nuclei are stable? 1. nuclei of H-1 and H-2, only 2. nuclei of H-1 and H-3 only 3. nuclei of H-2 and H-3 only 4. nuclei from H-1, H-2, and H-3

9.  What is the charge of the nucleus of an oxygen atom? 1. 0 2. –2 3. +8 4. +16

10.  Which atom in the ground state has an outermost electron with the most energy? 1. Cs 2. K 3. Li 4. Na

11.  What is the total number of orbitals containing only one electron in an atom of nitrogen in the ground state? 1. 1 2. 2 3. 3 4. 4

12. 12341234

13.  As a result of the gold foil experiment, it was concluded that an atom 1. contains protons, neutrons, and electrons 2. contains a small, dense nucleus 3. has positrons and orbitals 4. is a hard, indivisible sphere

14.  Which electron configuration represents an atom of aluminum in an excited state? 1. 2-7-4 2. 2-7-7 3. 2-8-3 4. 2-8-6

15.  What is the total number of sublevels that contain electrons in the third principal energy level of a nickel atom in the ground state? 1. 1 2. 2 3. 3 4. 4

16.  After decaying for 48 hours, 1/16 of the original mass of a radioisotope sample remains unchanged. What is the half-life of this radioisotope? 1. 3.0 h 2. 9.6 h 3. 12 h 4. 24 h

17.  Atom X and atom Z are isotopes of the element 1. aluminum 2. Carbon 3. Magnesium 4. nitrogen

18.  Which atom in the ground state has a partially filled second electron shell? 1. hydrogen atom 2. lithium atom 3. potassium atom 4. sodium atom

19.  An electron will emit energy in quanta when its energy state changes from 4p to 1. 5s 2. 5p 3. 3s 4. 6p

20.  An original sample of the radioisotope fluorine-21 had a mass of 80.0 milligrams. Only 20.0 milligrams of this original sample remain unchanged after 8.32 seconds. What is the half-life of fluorine-21? 1. 1.04s 2. 2.08s 3. 4.16s 4. 8.3s

21.  The nucleus of an atom of cobalt-58 contains 1. 27 protons and 31 neutrons 2. 27 protons and 32 neutrons 3. 59 protons and 60 neutrons 4. 60 protons and 60 neutrons