structure of an atom Flashcards
What is the primary concept introduced by Niels Bohr regarding atomic structure?
The quantization of electron energy levels in atoms.
True or False: Electromagnetic radiation can be described as a wave and a particle.
True.
Fill in the blank: The energy of a photon is directly proportional to its _____ and inversely proportional to its _____ .
frequency; wavelength.
What did Max Planck propose about energy in his quantum theory?
Energy is quantized and can only be emitted or absorbed in discrete amounts called quanta.
Which scientist is known for explaining the photoelectric effect using the concept of quantized energy?
Albert Einstein.
What is an atomic line spectrum?
A spectrum that consists of discrete lines, representing specific wavelengths of light emitted by atoms.
Multiple Choice: What is the formula for calculating the energy of a photon? A) E=mc² B) E=hf C) E=mv²
B) E=hf.
What does the ‘n’ in the Bohr model represent?
The principal quantum number, which indicates the energy level of an electron.
True or False: In the Bohr model, electrons can exist in any energy level.
False.
What is the significance of the Rydberg formula?
It predicts the wavelengths of spectral lines in hydrogen and other one-electron ions.
Fill in the blank: The _____ principle states that no two electrons in an atom can have the same set of quantum numbers.
Pauli exclusion.
What is the relationship between wavelength and frequency in electromagnetic radiation?
They are inversely related; as wavelength increases, frequency decreases.
Which phenomenon demonstrates the particle nature of light?
The photoelectric effect.
Multiple Choice: Which of the following best describes quantization? A) Continuous variation B) Discrete levels C) Random distribution
B) Discrete levels.
What is the lowest energy level of an electron in an atom called?
The ground state.
True or False: Higher energy levels in an atom are closer to the nucleus.
False.
What happens when an electron transitions from a higher energy level to a lower one?
A photon is emitted.
Fill in the blank: According to Planck’s equation, E = _____, where E is energy, h is Planck’s constant, and f is frequency.
hf.
What is the main contribution of Bohr’s model to atomic theory?
It introduced the idea of quantized orbits for electrons.
Which constant is used in the calculation of photon energy?
Planck’s constant (h).
Multiple Choice: What is the primary factor that determines the color of light emitted by an atom? A) Temperature B) Energy level transitions C) Electron mass
B) Energy level transitions.
What does the term ‘quantum leap’ refer to in atomic physics?
The sudden transition of an electron between energy levels.
True or False: The Bohr model applies to all elements equally well.
False.
What is the main limitation of the Bohr model?
It cannot accurately describe multi-electron atoms.
Fill in the blank: The emission spectrum of an element is unique and can be used for _____ identification.
elemental.
