whsad mr. quinn and ms. tom 10/25/13. an orbital is defined as a region of the most probable...
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An orbital is defined as a region of the most probable location of
1. an electron2. a neutron3. a nucleus4. a proton
Bohr Model: 2 Points
Which phrase describes an atom?1. a positively charged electron cloud surrounding a
positively charged nucleus2. a positively charged electron cloud surrounding a
negatively charged nucleus3. a negatively charged electron cloud surrounding
a positively charged nucleus4. a negatively charged electron cloud surrounding
a negatively charged nucleus
Wave Model: 2 Points
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.
Nuclear Chemistry: 2 Points
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.
Atomic Theory: 2 Points
Which elements are present in this mixture?
1. E and D, only2. E and G, only3. D and G, only4. D, E, and G
Bohr Model: 4 Points
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
Wave Model: 4 Points
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, only2. nuclei of H-1 and H-3 only3. nuclei of H-2 and H-3 only4. nuclei from H-1, H-2, and H-3
Nuclear Chemistry: 4 Points
Which atom in the ground state has an outermost electron with the most energy?
1. Cs2. K3. Li4. Na
Bohr Model: 6 Points
What is the total number of orbitals containing only one electron in an atom of nitrogen in the ground state?
1. 12. 23. 34. 4
Wave Model: 6 Points
As a result of the gold foil experiment, it was concluded that an atom
1. contains protons, neutrons, and electrons2. contains a small, dense nucleus3. has positrons and orbitals4. is a hard, indivisible sphere
Atomic Theory: 6 Points
Which electron configuration represents an atom of aluminum in an excited state?
1. 2-7-42. 2-7-73. 2-8-34. 2-8-6
Bohr Model: 8 Points
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. 12. 23. 34. 4
Wave Model: 8 Points
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 h2. 9.6 h3. 12 h4. 24 h
Nuclear Chemistry: 8 Points
Atom X and atom Z are isotopes of the element1. aluminum 2. Carbon3. Magnesium4. nitrogen
Atomic Theory: 8 Points
Which atom in the ground state has a partially filled second electron shell?
1. hydrogen atom2. lithium atom3. potassium atom4. sodium atom
Bohr Model: 10 Points
An electron will emit energy in quanta when its energy state changes from 4p to
1. 5s2. 5p3. 3s4. 6p
Wave Model: 10 Points
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. 1.04s2. 2.08s3. 4.16s4. 8.3s
Nuclear Chemistry: 10 Points