# 2.7 - Ground-state & Excited-state Conversions

10 Questions | Total Attempts: 306

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Try this quiz without looking at your notes. ONLY use your Periodic Table. Be as honest with yourself as possible when taking this quiz.

• 1.
An atom in the ground state has 39 protons and 50 neutrons. How many electrons are in each shell in this atom in the ground state?
• A.

2 electrons in the first shell, 8 electrons in the second shell, 18 electrons in the third shell, 32 electrons in the fourth shell, 50 electrons in the fifth shell

• B.

2 electrons in the first shell, 8 electrons in the second shell, 18 electrons in the third shell, 9 electrons in the fourth shell, 2 electrons in the fifth shell

• C.

2 electrons in the first shell, 8 electrons in the second shell, 18 electrons in the third shell, 32 electrons in the fourth shell, 2 electrons in the fifth shell

• D.

2 electrons in the first shell, 8 electrons in the second shell, 18 electrons in the third shell, 9 electrons in the fourth shell

• 2.
Which electron configuration represents an atom of selenium in an excited state?
• A.

2-7-18-7

• B.

2-7-17-4

• C.

2-8-18-6

• D.

2-7-17-7

• 3.
An atom has an electron configuration of 2-6-18-18-5. How do the energy and charge of the electrons in the first and fourth shells of this atom compare to one another?
• A.

The energy of the electrons in the first shell are less than that of the electrons in the fourth shell. The charge of the electrons in the first shell is less than that of electrons in the fourth shell.

• B.

The energy of the electrons in the first shell are less than that of the electrons in the fourth shell. The charge of the electrons in the first shell and the fourth shell are the same.

• C.

The energy of the electrons in the first shell are the same as that of the electrons in the fourth shell. The charge of the electrons in the first shell and the fourth shell are also the same.

• D.

The energy of the electrons in the first shell are the same as that of the electrons in the fourth shell. The charge of the electrons in the first shell is less than that of electrons in the fourth shell.

• 4.
What happens to electron energy and electron location when an atom changes from the ground state to the excited state?
• A.

The electron energy increases in moving from the ground state to the excited state, while the electron moves closer to the nucleus in moving to the excited state.

• B.

The electron energy decreases in moving from the ground state to the excited state, while the electron moves further from the nucleus in moving to the excited state.

• C.

The electron energy increases in moving from the ground state to the excited state, while the electron moves further from the nucleus in moving to the excited state.

• D.

The electron energy decreases in moving from the ground state to the excited state, while the electron moves closer to the nucleus in moving to the excited state.

• 5.
An atom in an excited state has an electron configuration of 2-7-14-3. What is the electron configuration of this atom in the ground state?
• A.

2-8-14-3

• B.

2-8-14-2

• C.

2-7-15-2

• D.

2-8-15-1

• 6.
An atom in an excited state has an electron configuration of 2-7-15-4. Why is this atom electrically neutral?
• A.

Because the maximum number of electrons are present in each energy level.

• B.

Because the number of protons and the number of electrons are equivalent.

• C.

Because the number of electrons in each energy level is less than the maximum amount possible.

• D.

Because the number of electrons in the electron shells do not match the ground-state electron configuration.

• 7.
An atom in an excited state has an electron configuration of 2-7-17-16-3. How do the second, third, and fifth shells demonstrate that this atom is in an excited state?
• A.

This configuration does NOT match 2-8-18-15-2, which is the ground-state configuration for an atom with an atomic number of 45.

• B.

This configuration does NOT match 2-8-18-15-1, which is the ground-state configuration for an atom with an atomic number of 44.

• C.

This configuration does NOT match 2-8-18-16-1, which is the ground-state configuration for an atom with an atomic number of 45.

• D.

This configuration does NOT match 2-8-18-18, which is the ground-state configuration for an atom with an atomic number of 46.

• 8.
Which of the following represents an atom of molybdenum in an excited state?
• A.

2-8-18-12-2

• B.

2-7-19-13-1

• C.

2-6-19-14-1

• D.

2-7-18-13-1

• 9.
An atom in an excited state has an electron configuration of 2-8-17-2. What is the electron configuration of this atom in the ground state?
• A.

2-8-18-1

• B.

2-8-18-2

• C.

2-8-18-1-1

• D.

2-8-18-3

• 10.
An atom in an excited state has an electron configuration of 2-7-12-2. What is the number of protons and the identity of this element?
• A.

22, the identity of the element is V

• B.

23, the identity of the element is Ti

• C.

23, the identity of the element is V

• D.

22, the identity of the element is Ti