객관식
A Bohr model shows a nucleus with 6 protons and 6 neutrons, surrounded by two electron shells: the first shell contains 2 electrons, and the second shell contains 4 electrons. Which element does this Bohr model represent?
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9. Quantum Mechanics
Bohr Model
Multiple Choice
Which of the following correctly describes the Bohr model representation of a boron atom?
A
A nucleus with 5 protons and 5 neutrons, surrounded by 10 electrons arranged in two energy levels
B
A nucleus with 11 protons and 12 neutrons, surrounded by 5 electrons in a single energy level
C
A nucleus with 5 protons and 5 neutrons, surrounded by 5 electrons arranged in two energy levels (2 in the first, 3 in the second)
D
A nucleus with 5 protons and 6 neutrons, surrounded by 5 electrons all in the first energy level
검증된 단계별 안내1
Identify the atomic number of boron, which is 5. This means a boron atom has 5 protons in its nucleus.
Determine the number of neutrons in the most common isotope of boron, which is typically 5 or 6 neutrons. This affects the nucleus composition but not the electron arrangement.
Recall that the number of electrons in a neutral atom equals the number of protons, so boron has 5 electrons.
Understand the Bohr model electron arrangement: electrons fill energy levels starting from the lowest. The first energy level can hold up to 2 electrons, and the second can hold up to 8 electrons.
Distribute the 5 electrons of boron into the energy levels accordingly: 2 electrons in the first energy level and 3 electrons in the second energy level.
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