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Quantum Mechanics and Atomic Structure
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Quantum Mechanics and Atomic Structure
Quantum Mechanics and Atomic Structure
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1
Question
What is the reason that protons and electrons do not attract each other and cause the atom to collapse?
Answer
The reason relates to the behavior of light and energy states.
2
Question
What is electromagnetic radiation (EMR)?
Answer
Electromagnetic radiation (EMR) is the full spectrum of light, including X rays, Ultraviolet (UV), Visible (Vis), Infrared (IR), Microwave, and Radio.
3
Question
What is the speed of light (c)?
Answer
c = 3.00 x 10^8 m/s.
4
Question
What is the photoelectric effect?
Answer
The photoelectric effect relates the intensity of light to its frequency.
5
Question
What is the relationship between light's energy (E), Planck's constant (h), and frequency (ν)?
Answer
E = hν, where h is Planck's constant (6.626 x 10^-34 J.s) and E is measured in Joules (J).
6
Question
How is frequency (ν) measured?
Answer
Frequency is measured in inverse seconds (s^-1) or Hertz (Hz).
7
Question
Given a light with a wavelength of 481 nm, how do you determine its frequency?
Answer
Use the formula: ν = c/λ, where c is the speed of light and λ is the wavelength.
8
Question
What is the color of light with a wavelength of 481 nm?
Answer
The color is typically a shade of blue.
9
Question
What is the wavelength of a photon with a frequency of 4.61 x 10^14 s^-1?
Answer
Use the formula: λ = c/ν to calculate the wavelength.
10
Question
How do you calculate the energy of a photon carrying 3.8 x 10^-19 J?
Answer
Using E = hν, where you need to first find the frequency.
11
Question
What is the term for the lowest energy state of an electron in an atom?
Answer
Ground state.
12
Question
What is the term for the higher energy state of an electron further from the nucleus?
Answer
Excited state.
13
Question
What does the line emission spectrum indicate about an element?
Answer
It shows that only certain energy states are allowed for the electron.
14
Question
Who proposed the Bohr model and in what year?
Answer
Niels Bohr proposed the Bohr model in 1913.
15
Question
What does the Bohr model state about electron orbits?
Answer
Electrons orbit the nucleus in certain allowed energy orbits.
16
Question
What happens when an electron gains energy in the Bohr model?
Answer
The electron gets excited and moves to a higher energy level.
17
Question
What principle states that you cannot determine both the position and velocity of an electron at the same time?
Answer
Heisenburg Uncertainty Principle.
18
Question
What does the Schrodinger Wave Equation describe?
Answer
It mathematically describes the wave properties of electrons.
19
Question
What do quantum numbers describe?
Answer
Quantum numbers describe orbitals and the electrons in them.
20
Question
What are the four types of quantum numbers?
Answer
Principal quantum number (n), Angular momentum quantum number (l), Magnetic quantum number (ml), Spin quantum number (ms).
21
Question
What does the value of 'l' indicate?
Answer
The value of 'l' indicates the shape of the orbital.
22
Question
What is the Aufbau principle?
Answer
The Aufbau principle states to place the electron in the lowest possible energy orbital.
23
Question
What does the Pauli exclusion principle state?
Answer
No two electrons in the same atom can have the same set of four quantum numbers.
24
Question
What does Hund's rule state about degenerate orbitals?
Answer
Degenerate orbitals will hold one electron each before any orbital gets a second electron.
25
Question
What is electron configuration?
Answer
Electron configuration is the arrangement of electrons in the atom or the 'address' of the electrons.
26
Question
What is the significance of 'd4' and 'd9' exceptions in electron configurations?
Answer
These configurations are more stable when one electron is promoted from the s orbital to achieve d5 or d10.
27
Question
Identify the element with the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d7.
Answer
Ruthenium (Ru).
28
Question
Identify the element with the electron configuration 1s2 2s2 2p6 3s2 3p3.
Answer
Arsenic (As).
29
Question
Identify the element with the electron configuration 1s2 2s2 2p6 3s2 3p6 4s1.
Answer
Potassium (K).