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Questions and Answers
According to quantum theory, what did Plank propose about the energy of the heated atom?
According to quantum theory, what did Plank propose about the energy of the heated atom?
- The energy is released as a combination of different wavelengths
- The energy is released in random intervals
- The energy is released in small bursts called quanta (correct)
- The energy is continuously released in a smooth curve
What does the quantum (wave) mechanical model describe an electron as?
What does the quantum (wave) mechanical model describe an electron as?
- A standing wave (correct)
- A cloud of negative charge
- A circular orbit around the nucleus
- A particle with fixed position
Which quantum number describes the orbital size or energy level of an electron?
Which quantum number describes the orbital size or energy level of an electron?
- Secondary (l)
- Spin (ms)
- Magnetic (ml)
- Principal (n) (correct)
What values are allowed for the secondary quantum number (l)?
What values are allowed for the secondary quantum number (l)?
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What property does the spin quantum number (ms) describe?
What property does the spin quantum number (ms) describe?
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Study Notes
Quantum Theory
- Max Planck proposed that the energy of a heated atom is quantized, meaning it can only take on specific discrete values, rather than being continuous.
Electron Description
- The quantum (wave) mechanical model describes an electron as a wave function, which gives the probability of finding the electron within a particular region of space.
Orbital Size and Energy Level
- The principal quantum number (n) describes the orbital size or energy level of an electron, with higher values indicating higher energy levels and greater distances from the nucleus.
Secondary Quantum Number (l)
- The secondary quantum number (l) is allowed to take on integer values from 0 to n-1, where n is the principal quantum number.
Spin Quantum Number (ms)
- The spin quantum number (ms) describes the intrinsic angular momentum or spin of an electron, which can have values of +1/2 or -1/2, corresponding to "up" and "down" spin states.
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