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Topic 3 - The Atomic Structure
12. Electron shells: Determining and interpreting number of electron shells of an atom:
1. How many electron shells containing electrons are in a neutral atom of Oxygen? 4) 16
3) 6
2) 2
1) 1
2. What is the total number of electron shells in an atom of Bromine? 4) 7
3) 4
2) 2
1) 1
3. The electron configuration of an atom in the ground state is 2 – 4 . The total number of occupied
electron shells in this atom is
1) 2 2) 4 3) 6 4) 8
4. How many electron shells are in a ground state atom with atomic number of 18?
1) 1 2) 2 3) 3 4) 4
5. Which is a ground state electron configuration of an atom in the fourth electron shell?
the most energy? Teacher Preview Copy
Teacher Preview Copy
1) 2 – 8 – 4 2) 2 – 8 – 18 – 4 3) 2 – 8 – 18 – 18 – 4 4) 2 – 4
6. Which electron configuration is of an atom with three electron shells?
1) 2 2) 2 - 3 3) 2 – 8 - 8 4) 2 – 8 – 18 – 3
7. An atom has atomic number of 56. What is the minimum number of electrons shells that is need to
contain all of its electrons in the ground state?
1) 5 2) 18 3) 56 4) 6
8. A neutral atom with 48 electrons will have a ground state configuration with
1) One electron shell containing the electrons
2) Three electron shells containing the electrons
3) Four electron shells containing the electrons
4) Five electron shells containing the electrons
9. Which of these atoms in the ground state has the most number of electron shells containing electrons?
1) Cs-132 2) Xe - 134 3) I - 127 4) Na - 23
10. Which of the following elements has an atom with the least number of electron shells containing
electrons? 2) F 3) Na 4) K
1) Cl
13. Electron shells: Determining electron shell containing electrons with the most or least energy:
1. Which electron shell of a sulfur atom contains electrons with the least amount of energy?
1) 1 2) 2 3) 3 4) 6
2. In the configuration, 2 – 8 – 8 – 1, which electron shell contains electrons with the most energy?
th
rd
th
st
1) 4 2) 3 3) 8 4) 1
3. In the ground state configuration of calcium, in which electron shell would one find electrons with
1) 2 shell 2) 3 shell 3) 4 shell 4) 8 shell
th
rd
th
nd
4. In the ground state atom of silicon, which electron shell contains electron with the greatest amount
of energy?
1) First electron shell 3) Third electron shell
2) Second electron shell 4) Fourth electron shell
5. In a bromine atom in the ground state, the electrons that has the least amount of energy are located
in the
1) First electron shell 3) Third electron shell
2) Second electron shell
4) Fourth electron shell
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 173
Topic 3 - The Atomic Structure
12. Electron shells: Determining and interpreting number of electron shells of an atom:
1. How many electron shells containing electrons are in a neutral atom of Oxygen? 4) 16
3) 6
2) 2
1) 1
2. What is the total number of electron shells in an atom of Bromine? 4) 7
3) 4
2) 2
1) 1
3. The electron configuration of an atom in the ground state is 2 – 4 . The total number of occupied
electron shells in this atom is
1) 2 2) 4 3) 6 4) 8
4. How many electron shells are in a ground state atom with atomic number of 18?
1) 1 2) 2 3) 3 4) 4
5. Which is a ground state electron configuration of an atom in the fourth electron shell?
the most energy? Teacher Preview Copy
Teacher Preview Copy
1) 2 – 8 – 4 2) 2 – 8 – 18 – 4 3) 2 – 8 – 18 – 18 – 4 4) 2 – 4
6. Which electron configuration is of an atom with three electron shells?
1) 2 2) 2 - 3 3) 2 – 8 - 8 4) 2 – 8 – 18 – 3
7. An atom has atomic number of 56. What is the minimum number of electrons shells that is need to
contain all of its electrons in the ground state?
1) 5 2) 18 3) 56 4) 6
8. A neutral atom with 48 electrons will have a ground state configuration with
1) One electron shell containing the electrons
2) Three electron shells containing the electrons
3) Four electron shells containing the electrons
4) Five electron shells containing the electrons
9. Which of these atoms in the ground state has the most number of electron shells containing electrons?
1) Cs-132 2) Xe - 134 3) I - 127 4) Na - 23
10. Which of the following elements has an atom with the least number of electron shells containing
electrons? 2) F 3) Na 4) K
1) Cl
13. Electron shells: Determining electron shell containing electrons with the most or least energy:
1. Which electron shell of a sulfur atom contains electrons with the least amount of energy?
1) 1 2) 2 3) 3 4) 6
2. In the configuration, 2 – 8 – 8 – 1, which electron shell contains electrons with the most energy?
th
rd
th
st
1) 4 2) 3 3) 8 4) 1
3. In the ground state configuration of calcium, in which electron shell would one find electrons with
1) 2 shell 2) 3 shell 3) 4 shell 4) 8 shell
th
rd
th
nd
4. In the ground state atom of silicon, which electron shell contains electron with the greatest amount
of energy?
1) First electron shell 3) Third electron shell
2) Second electron shell 4) Fourth electron shell
5. In a bromine atom in the ground state, the electrons that has the least amount of energy are located
in the
1) First electron shell 3) Third electron shell
2) Second electron shell
4) Fourth electron shell
Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. SurvivingChem.com 173
