Chem Chapter 5: Electrons in Atoms Test
DO NOT WRITE ON TEST!!!!!!!!!! PUT ANSWERS ON ANSWER SHEET!!
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) Which electron configuration represents a violation of the Pauli exclusion principle?
A)
B)
C)
D)
2) How many energy sublevels exist within the 4th principal energy level?
A) 2
B) 4
C) 1
D) 3
3) According to the Bohr atomic model, the third energy level in an atom can hold how many electrons?
A) 2
B) 8
C) 9
D) 18
E) 6
4) For elements whose electron configurations are exceptions to the aufbau principle (like chromium and copper), you must:
A) increase in the number of electrons in both the 3 d and 4s orbitals.
B) reduce the number of electrons in the 4s orbital and increase the number of electrons in the 3 d orbital.
C) reduce the number of electrons in the 3d orbital and increase the number of electronsin the 4s orbital.
D) reduce the number of electrons in both the 3d and 4s orbitals.
5) The letters s, p, d, f designate
A) different electron energy levels.
C) different types of electrons.
B) different electron orbitals within an energy level.
D) valence electrons.
6) What is the term for the shorthand description of the arrangement of electrons by orbitals according to increasing energy?
A) atomic notation
B) electron configuration
C) continuous spectrum
D) atomic number
7) Which electron configuration represents a violation of Hund's rule?
A)
C)
B)
D)
8) What is the maximum number of electrons that can occupy an f energy sublevel?
A) 7
B) 10
C) 6
D) 14
9) Which is an IMPOSSIBLE electron configuration?
A) 1s 2 2s2 2p4
B) 1s 2 2s2
D) 1s 2 2s2 2p4 3s1
C) 1s 3 2s2 2p4
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10) When an electron moves from the ground state to the excited state, it
A) gives off energy and moves farther from the nucleus.
C) absorbs energy and moves closer to the nucleus.
11) Which of the following is not possible?
A) 5p
B) 4d
B) gives off energy and moves closer to the nucleus.
D) absorbs energy and moves farther from the nucleus.
C) 3f
12) Which orbital can have a dumbbell with a doughnut-shaped?
A) 2s
B) 4d
D) 2p
C) 3p
E) 2s
D) 5g
13) Which one of the following is the correct electron configuration for a ground-state nitrogen atom?
A)
B)
C)
D)
14) What is the electron configuration for an atom of nickel?
A) 1s2 2s2 2p 6 3s2 3p 6 4s2 3d 8
C) 1s2 2s2 2p 6 3s2 3p 6 4s2 4d 8
B) 1s2 2s2 2p 6 3s2 3p 6 3d 8
D) 1s2 2s2 2p 6 3s2 3p 6 4s2 4p 8
15) An atomic orbital represents:
A) the region of electron density for a covalent bond
B) the repulsion of all the electrons among themselves
C) a fixed path that an electron follows around the nucleus of an atom
D) the region of high probability for an electron around the nucleus of an atom
16) Which of the following is the best description of the Bohr atom?
A) an indivisible, indestructible particle
B) a homogeneous sphere of "plum-pudding"
C) a sphere with a heavy, dense nucleus circled by electrons in orbits
D) a sphere with a heavy, dense nucleus surrounded by electrons
17) Which is the correct electron configuration for the element Molybdenum (Mo)?
A) 1s 2 2s 2 2p6 3s 2 3p6 3d104s 2 4p6 5s 6
B) 1s 2 2s 2 2p6 3s 2 3p6 3d4 4s 2
C) 1s 2 2s 2 2p6 3s 2 3p6 3d104s 2 4p6 4d4 5s 2
D) 1s 2 2s 2 2p6 3s 2 3p6 3d104s 2 4p6 4d5 5s 1
18) "When filling orbitals of equal energy, electrons fill them singly first with the same spin." This is known as:
A) Ground state.
B) Hund's rule.
C) Pauli exclusion principle.
D) Bohr's model.
E) none of the above
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19) "One places electrons into orbitals from low energy to high energy" is one way of stating the:
A) Heisenberg Principle
B) Hund's Rule
C) Aufbau principle
D) Pauli Exclusion Principle
E) Rydberg's Principle
20) According to the Bohr atomic theory, electrons in an atom travel in __________ around the nucleus.
A) orbits
B) jumps
C) shifts
D) steps
21) What is the electron configuration for potassium (atomic number 19)?
A) 1s2 2s2 2p 6 3s2 3p 6 4s1
B) 1s2 2s2 2p 6 3s2 3p 5 3d 2
C) 1s2 2s2 2p 6 3s2 3p 5 4s1
D) 1s2 2s2 2p 8 3s2 3p 5
22) What is the maximum number of electrons allowed for energy level n = 4?
A) 18
B) 32
C) 9
D) 72
E) 4
23) After the 5p orbital, which are the next orbitals to be filled?
A) 6s
B) 5d
C) 4d
D) 4p
E) 4f
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
24) A student records the following electron configuration for the element Arsenic (As). What is wrong with this
student’s answer?
1s 2 2s22p6 3s23p6 4s24d104p3
25) Which rule for filling of orbitals by electrons in the element Nitrogen is being violated in the orbital diagram
shown? EXPLAIN your answer.
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Answer Key
Testname: CHEM CHAP 5 TEST TG
1) B
2) B
3) D
4) B
5) B
6) B
7) D
8) D
9) C
10) D
11) C
12) B
13) D
14) A
15) D
16) C
17) D
18) B
19) C
20) A
21) A
22) B
23) A
24)
25)
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