Name: ________________________
UNIT 03 - ATOMIC STRUCTURE
Date: _________________________
Period: _______________________
Objectives
2b. Research and explain crucial contributions and critical experiments of Dalton, Thomson, Rutherford, Bohr, and Schrődinger
and describe how each discovery contributed to the current model of atomic and nuclear structure.
2c1. Properties and interactions of the three fundamental particles of the atom
3a1. Write the electron configurations of elements and ions following the Aufbau principle, and balance equations representing
nuclear reactions.
3a2. Calculate the number of protons, neutrons, and electrons in individual isotopes using atomic numbers and mass numbers.
Atomic History (2b)
1. Which conclusion was a direct result of the gold foil experiment?
A.
B.
C.
D.
An atom is mostly empty space with a dense, positively charged nucleus.
An atom is composted of at least three types of subatomic particles.
An electron has a positive charge and is located inside the nucleus.
An electron has properties of both waves and particles.
2. Which group of atomic models is listed in historical order from the earliest to the most recent?
A.
B.
C.
D.
plum-pudding model, wave-mechanical model, Bohr model
plum-pudding model, Bohr model, wave-mechanical model
Bohr model, wave-mechanical model, plum-pudding model
Bohr model, plum-pudding model, wave-mechanical model
3. Which model correctly describes the locations of protons and electrons in the wavemechanical model of the atom?
Model
A
B
C
D
Proposed Models of the Atom
Location of Protons
Location of Electrons
In the nucleus
Specific shells
In the nucleus
Regions of most probably location
Dispersed throughout the atom
Specific shells
Dispersed throughout the atom
Regions of most probable location
4. Which of the statements below regarding J.J. Thomson’s model of the atom is NOT true?
A.
B.
C.
D.
there were negative particles (later called electrons)
it was called the ‘plum pudding model’
there were positive particles in the nucleus (later called protons)
it was the first atomic model to include subatomic particles
5. Which of the statements below regarding Dalton’s atomic theory is considered true today?
A.
B.
C.
D.
All elements are composed of tiny indivisible particles called atoms.
Atoms of the same element are identical.
Atoms of different elements can physically mix together to form compounds.
Chemical reactions occur when atoms are separated, joined or rearranged.
Properties and Interactions (2c1)
6. Compared to a proton, an electron has:
A.
B.
C.
D.
a greater quantity of charge and the same sign
a greater quantity of charge and the opposite sign
the same quantity of charge and the same sign
the same quantity of charge and the opposite sign
7. The atomic number of an atom always equal to the number of its:
A. protons, only
B. protons plus electrons
C. neutrons, only
D. protons plus neutrons
8. The mass of a proton is approximately equal to the mass of:
A. an alpha particle
B. an electron
C. a neutron
D. a positron
9. What is the total charge of the nucleus of a carbon atom?
A. 0
B. +12
C. -6
D. +6
10. Which statement best describes the nucleus of an aluminum atom?
A.
B.
C.
D.
It has a charge of -13 and is surrounded by a total of 10 electrons.
It has a charge of -13 and is surrounded by a total of 13 electrons.
It has a charge of +13 and is surrounded by a total of 10 electrons.
It has a charge of +13 and is surrounded by a total of 13 electrons.
Electron Configurations (3a1)
11. What is the correct electron configuration of nickel?
A. 1s2 2s2 2p6 3s2 3p6 4s2 4d8
B. 1s2 2s2 2p6 4s2 3d8
C. 1s2 2s2 2p4 2p6 3s2 3p4 4s2 3d8
D. 1s2 2s2 2p6 3s2 3p6 4s2 3d8
12. Which of the following electron configurations are possible?
1.
2.
3.
4.
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2
1s2 2s2 2p6 3s2 3p6 4s2 4d10 4p6 5s2
1s2 2s2 2p6 3s2 3p6 4s2 3d8 4p6 5s2
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10
A. 2 and 4
B. 1 and 4
C. 1, 3 and 4
D. All are possible
13. What is the total number of protons in an atom with the electron configuration 1s2 2s2 2p6 3s2
3p1?
A. 15
B. 13
C. 11
D. 20
14. According to the wave-mechanical model of the atom, electrons in an atom:
A. are most likely found in the excited state
B. have a positive charge
C. are located in orbitals outside the nucleus
D. travel in defined circles
15. Which of the following electron configurations represents arsenic using proper noble gas
configuration?
A. [He] 2s22p63s23p64s23d104p3
B. [Ne] 3s23p64s23d104p3
C. [Ar] 4s23d104p3
D. [Ar] 4s24d104p3
Isotopes (3a2)
16. Calculate the mass number of an atom that contains 28 protons, 28 electrons, and 34
neutrons.
A. 28
B. 56
C. 62
D. 90
17. Which atom contains exactly 15 protons?
A. P-32
B. S-32
C. O-15
D. N-15
18. Which symbols represent isotopes of the same element?
A. carbon-14 and nitrogen-14
B. oxygen-16 and oxygen-18
C. iodine-131 and iodine-131
D. radon-222 and radium-222
19. Compared to an atom of phosphorus - 31, an atom of sulfur - 32 contains:
A. one less neutron
C. one more neutron
B. one less proton
D. one more proton
20. The diagram below represents the nucleus of an atom:
A.
B.
C.
D.
The atomic number is 9 and the mass number is 19
The atomic number is 9 and the mass number is 20
The atomic number is 11 and the mass number is 19
The atomic number is 11 and the mass number is 20
21. Fill in the following table. All atoms are neutrally charged. [15]
Isotope
Hyphen
Notation
Nuclear
Symbol
Protons
Neutrons
Electrons
Electron Configuration
(noble gas notation)
7
nitrogen - 16
20
20
20
14
[Ar]4s23d9
28
[Ne]3s2
22. Select a scientist from the list below and write a brief account of their contribution to science.
Include any crucial contributions and critical experiments, and describe how the discovery
contributed to the current model of atomic and nuclear structure. Also, include any other relevant
details. [5]

John Dalton

Ernest Rutherford

J.J. Thomson

Niels Bohr
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