Originate from the movement of electrical charges Do not require a medium to move.
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Transcript of Originate from the movement of electrical charges Do not require a medium to move.
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Originate from the movement of electrical charges
Do not require a medium to move
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________________- the distance of one wave cycle Often taken from one crest to the next but only has to be
two identical points Symbol is Length units
__________________- # of wave cycle that pass a given point in a given unit of time Symbol is Units: cycles/sec, sometimes written as 1/s, also equals
1 Hertz (Hz)_____________________
Distance between the zero amplitude line and the top of the crest
Waves with higher amplitudes carry more energy
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_________________ is the wavelength in meters is the frequency in s-1 (or Hz)c is the speed of the wave
For electromagnetic radiation, use the speed of light 2.99792458 x 108 m/s (round this to 3.00 x 108 m/s)
There is an _____________ relationship between wavelength and frequency
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Light can be passed through a prism and makes a rainbow. This is a ________________ spectrum.
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Proposed that electromagnetic energy comes in discreet amounts (or _____________________)
The energy of a quantum is expressed by ____________where h= 6.626 x
10-34 J sEnergy can only increase by
multiples: 1 h, 2 h, 3 h, and so on
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Applied the idea of quanta to explain how light can cause electricity:Tiny packets of light (photons) hit an atom. If they have enough energy, they can kick an
electron out of an atom (photoelectric effect)So light is a wave and a “packet”
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Remember: Bohr revised Rutherford’s model, putting the electrons in orbitals like planets around the sun
Excited electrons could jump orbital levelsWhen electrons returned to their original
level (ground state), they emit energyCreates a ________ spectrum
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Created when only a few wavelengths of the electromagnetic spectrum are seen
Gases of each element will make them when electricity passes through them or they’re heated up.
The lines can be seen when the light is passed through a prism.
Lines are different for each element (_____________________________)
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Mercury
Calcium
Sodium
Helium
Hydrogen
BRIGHT LINE SPECTRA
7500 7000 6500 6000 5500 5000 4500 4000 A
7500 7000 6500 6000 5500 5000 4500 4000 A
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Electron behave like ____________ (matter) and ____________ (electromagnetic radiation)
If this is true, electrons can’t be tied to a fixed orbit
We can’t even be certain of both an electron’s momentum and position at any one point in time (Heisenberg uncertainty principle)
Can only create shaded areas around the nucleus where there is a high _________________ of finding electrons
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System of numbers that gives each electron a unique address in any atom
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Also called ______Represents the primary energy levels around
the nucleus (kind of like Bohr’s rings)There are 7 energy levels so _____________Electrons with a higher n are in higher
energy orbital and spend more time away from the nucleus
Electrons with the same n are in the same principle shell
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Also called l or ___________Determines the shape of the orbital
____ sublevel _____ sublevel_____ sublevel_____ sublevel
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Spherical in shape
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Look like a dumbbell in each axis (x, y, and z)
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Also called ml or the orbitalIf
s subshell……_____ orbitalp subshell……_____ orbitalsd subshell……_____ orbitalsf subshell…..______ orbitals
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Two electrons can fill each orbitalAnother quantum number is needed so every
electron has its own numberElectron Spin Quantum Number
Also called ms
Electron can spin _________________________________
An orbital with two electrons has one of eachAlso represent them with ___________
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Silver has 47 electrons (odd number). On
average, 23 electrons will have one spin, 24 will
have the opposite spin.
The magnet splits the beam.
These silver atoms each have 24 +½-spin electrons and 23 –½-spin electrons.
These silver atoms each have 23 +½-spin electrons and 24 –½-spin electrons.
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Description of the placement of all the electrons in an atom of an element
RulesElectrons occupy the lowest energy orbitals
available (ground state). Filling order is determined by Aufbau Principle.
Orbitals can only hold 2 electrons and they must have opposing spins (Pauli exclusion principle)
Electrons will fill empty orbitals when possible. Half-filled orbitals all have parallel spin. (Hund’s rule)
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Remember this is the real location of the f block
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RegularEnergy level is written as a
numberSubshell letter is written
nextNumber of electrons in
subshell is given as an exponent
ExtendedSame as regular, but
subshells are divided into the individual orbitals
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RegularHe _________O ______________Cl ________________________
ExtendedHe __________O _____________________Cl _______________________________
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Same as spdf configuration but it starts from the noble gas of the previous period
ExamplesBe _______________K _______________Br ________________
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Same as spdf configuartions exceptNumber of electron in subshell is not writtenEach orbital within subshell is given a line↑ and ↓ arrows are drawn on the lines to
represent the electrons (fourth quantum number)
Make sure to follow Hund’s ruleExamples:
N _________________________O __________________________
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Electrons in the __________________of an atomElectrons in lower energy levels are called
______ electrons
Can be predicted by the periodic table for representative elements
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Helium only has 2.
D and f-block elements have 2, but can vary
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Dots are placed around the element symbol to represent to valence electrons
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To be stable, atoms want __________ in their outer shell
Noble gases already have 8 and don’t usually react with anyone
Others will lose or gain electrons to get to 8 Said to be isoelectronic with the Nobel gas from the last
periodIon will have the same electron configuration as this noble gas
Atoms that gain or lose electrons to become isoelectronic with Helium follow the duet rule (2 electrons in valence shell)
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Group 1- 1 valence electron Lose 1 electron, become +1 cation
Group 2- 2 valence electrons Lose 2 electrons, become +2 cation
Group 13- 3 valence electrons Lose 3 electrons, become +3 cation
Group 15- 5 valence electrons Gain 3 electrons, become -3 anion
Group 16- 6 valence electrons Gain 2 electrons, become -2 anion
Group 17- 7 valence electrons Gain 1 electron, become -1 anion
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Transition metals form cations, but the charge cannot be predicted
Group 14 does not commonly form ions
Group 18 does not form ions
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The metal properties of the elements increase as you move to the left and move down on the periodic table
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Metals Nonmetals
Conduct electricity well Don’t conduct electricity well
Malleable Brittle
Ductile Not ductile
Tend to lose electrons Tend to gain electrons
Low electronegativity High electronegativity
Slightly negative electron affinity Very negative electron affinity
Found in bases Found in acids
Shiny Dull
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Ionization energy is the amount of energy needed to remove an electron
Need more energy as you move up and to the right of the periodic table
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Electronegativity is the ability of an atom to attract electrons
Increases as you move up and to the right of the periodic table (noble gases sit out)
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Atomic size increases as you move down and to the left of the periodic table
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