Unit 2 Review and Nothing Else

WHSADMr. Quinn and Ms. Tom

10/25/13

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

What is the charge of the nucleus of an oxygen atom?

1. 02. –23. +84. +16

Atomic Theory: 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

Nuclear Chemistry: 6 Points

1234

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

The nucleus of an atom of cobalt-58 contains

1. 27 protons and 31 neutrons2. 27 protons and 32 neutrons3. 59 protons and 60 neutrons4. 60 protons and 60 neutrons

Atomic Theory: 10 Points