Karteikarten
Chemistry - Atomic Structure
Karten in diesem Stapel (27)
- 1What is the main energy level called, and how many electrons can it hold?Integer, and it can hold 2 electrons (2n^2)
- 2What are sub-levels?Sub-levels are spaces there's a high possibility of finding an electron.
- 3How can electromagnetic waves be distinguished?By their different wave lengths.
- 4What is frequency (v)?The number of waves that passes a point in a second.
- 5How is a continuous spectrum created?When sunlight passes through a prism or rain.
- 6What does atoms emit?Visible light, infrared and ultraviolet radiation.
- 7What does a spectrometer do?It analyses the radiation sent relative to the radiation received, which will produce an absorption spectrum.
- 8What happens when electromagnetic radiation passes through a collection of atoms?The radiation is absorbed and used to excite electrons.
- 9What are electron transitions, and what is released during these transitions?When electrons are excited from one energy level to a higher energy level, and packets of energy (quantum) or photons are released.
- 10What is the smallest unit of energy?Quantum.
- 11What happens when an atom falls back to the ground state?Light of a specific frequency is EMITTED.
- 12What happens when an electron moves from the ground state to an excited state?Light of a specific frequency is ABSORBED.
- 13When does hydrogen produce visible light?When the electron falls back to the second energy level. n=2
- 14MoleUnit for amount of chemical substance.
- 15Ionization energy(IE) is the amount of energy needed to remove the valence electron from a gaseous atom and form a cation.
- 16What do you need to do to develop a model of an atom further?Reconsider the nature of light and matter.
- 17What does quantum theory suggest?That it's preferable to think of electrons (or any particle) as having wave properties.
- 18When is a wave model preferable to use?During the diffraction / spreading out of light when light passes through a small slit.
- 19When is a particle model preferable to use?During the scattering of electrons when light falls on a metal surface.
- 20What demonstrates the wave properties of electrons?When a beam of electrons passes through a thin sheet of graphite.
- 21What is Heisenberg's Uncertainty Principle?We can't know where an electron is; we can only know where it's likely to be.
- 22Mention a flaw of the Bohr model.It assumes that the electron's trajectory can be precisely described, which is impossible, seeing as any attempt at measuring its trajectory will disturb its motion.
- 23Aufbau Principle- states that electrons are placed into orbitals of lower energy first. Boxes represent the atomic orbitals, with single-headed arrows to represent the spinning electrons.
- 24Atomic radiusthe distance from the nucleus to the outermost (farthest from the center) electron, which is hard to do, since the electron1s position isn't precisely known.
- 25What is atomic radii measured in?Picometers (pm) = a trillionth of a metre.
- 26Diogonal rulea rule that shows the order in which subshells are filled with electrons: starting at the top left, follow each arrow to its end, and then move to the top of the next arrow to the right.
- Heavier elements do not always follow the diagonal rule exactly. - 27Hund's rule
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- Karteikarten am Chemistry - Atomic Structure, erstellt von Piper Williams am 17/09/2016.
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- Piper Williams
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