16) A hydrogen atom with an electron initially in the n = 2 level is excited further until the electron is in the n = 4 level. The energy level change occurs because the atom has (1) emitted a 2.55-eV photon. (2) emitted a 0.85-eV photon. (3) absorbed a 2.55-eV photon. (4) absorbed a 0.85-eV photon. 17) After electrons in hydrogen atoms are excited to the n = 3 energy state, how many different frequency of radiation can be emitted as the electrons return to the ground state? (1) 1 (2) 2 (3) 3 (4) 4 18) What is the minimum energy needed to ionize a hydrogen atom in the n = 2 energy state? (1) 13.6 eV (2) 1.89 eV (3) 10.2 eV (4) 3.40 eV 19) The electron in a hydrogen atom drops from energy level n = 2 to energy level n = 1 by emitting a photon having an energy of approximately (1) 1.6 x 10-18 J. (3) 5.4 x 10-19 J (2) 2.2 x 10-18 J. (4) 7.4 x 10-18 J 20) An electron in a hydrogen atom drops from the n = 3 energy level to the n = 2 energy level. The energy of the emitted photon is (1) 1.51 eV. (3) 3.40 eV. (4) 4.91 eV. (2) 1.89 eV. 21) The number of protons plus neutrons of an atom is known as its (1) mass number. (3) total number. (2) atomic number. (4) decay number.
16) A hydrogen atom with an electron initially in the n = 2 level is excited further until the electron is in the n = 4 level. The energy level change occurs because the atom has (1) emitted a 2.55-eV photon. (2) emitted a 0.85-eV photon. (3) absorbed a 2.55-eV photon. (4) absorbed a 0.85-eV photon. 17) After electrons in hydrogen atoms are excited to the n = 3 energy state, how many different frequency of radiation can be emitted as the electrons return to the ground state? (1) 1 (2) 2 (3) 3 (4) 4 18) What is the minimum energy needed to ionize a hydrogen atom in the n = 2 energy state? (1) 13.6 eV (2) 1.89 eV (3) 10.2 eV (4) 3.40 eV 19) The electron in a hydrogen atom drops from energy level n = 2 to energy level n = 1 by emitting a photon having an energy of approximately (1) 1.6 x 10-18 J. (3) 5.4 x 10-19 J (2) 2.2 x 10-18 J. (4) 7.4 x 10-18 J 20) An electron in a hydrogen atom drops from the n = 3 energy level to the n = 2 energy level. The energy of the emitted photon is (1) 1.51 eV. (3) 3.40 eV. (4) 4.91 eV. (2) 1.89 eV. 21) The number of protons plus neutrons of an atom is known as its (1) mass number. (3) total number. (2) atomic number. (4) decay number.
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16)
A hydrogen atom with an electron initially in the n = 2 level is excited further until the electron is in
the n=4 level. The energy level change occurs because the atom has
(1) emitted a 2.55-eV photon.
(2) emitted a 0.85-eV photon.
(3) absorbed a 2.55-eV photon.
(4) absorbed a 0.85-eV photon.
17)
After electrons in hydrogen atoms are excited to the n = 3 energy state, how many different frequency
of radiation can be emitted as the electrons return to the ground state?
(1) 1
(2) 2
(3) 3
(4) 4
18)
What is the minimum energy needed to ionize a hydrogen atom in the n = 2 energy state?
(1) 13.6 eV
(3) 10.2 eV
(2) 1.89 eV
(4) 3.40 eV und
19)
The electron in a hydrogen atom drops from energy level n = 2 to energy level n = 1 by emitting a
photon having an energy of approximately
(1) 1.6 x 10-18 J.
(3) 5.4 x 10-19 J
(2) 2.2 x 10-18 J.
(4) 7.4 x 10-18 J
20)
An electron in a hydrogen atom drops from the n = 3 energy level to the n = 2 energy level. The
energy of the emitted photon is
(1) 1.51 eV.
(3) 3.40 eV.
(4) 4.91 eV.
(2) 1.89 eV.
(5)
The number of protons plus neutrons of an atom is known as its
(1) mass number.
(3) total number.
(2) atomic number.
(4) decay number.
21)
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