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In electromagnetic wave calculations, what is "c"?
speed of light= 3.00x10^8 m/s/s
In electromagnetic wave calculations, what is "h"?
Planck's constant= 6.626 x 10^-34 Jxs
Electromagnetic waves with greater energy have (larger or smaller) wavelengths?
smaller
True or False: Electrons move in circular paths around the nucleus of the atom.
False
What element is in the 3rd period and has 2 valence electrons?
Magnesium (Mg)
True or False: Elements in the same period have similar chemical properties?
False
True or False: Elements in the same group/family have similar chemical properties?
True
What are valence electrons?
electrons in the highest (outer most) energy level
How many valence electrons does every element in group/family 17 of the periodic table have?
7
How many valence electrons does every element in group/family 14 of the periodic table have?
4
How many valence electrons does every element in group/family 2 of the periodic table have?
2
How can you use the periodic table to determine the number of energy levels an atom has?
look at the period (horizontal row) the element is in
What is the maximum number of electrons that can occupy energy level 6?
32
What is the maximum number of electrons that can occupy energy level 5?
18
What is the maximum number of electrons that can occupy energy level 3?
8
What is the maximum number of electrons that can occupy energy level 2?
8
What is the maximum number of electrons that can occupy energy level 1?
2
Why can atomic emission spectra be used to identify unknown samples?
because the wavelengths emitted from each element are unique to that element (the color flame is unique to the element)
Describe what caused the colored flames in the flame test lab.
electrons absorbed energy from the flame; jumped to higher less stable energy level; released energy as they fell back to ground state
What is the energy of a photon whose frequency is 3.9x10^14 Hz? (include proper units in your answer)
E=hv=(6.626x10^-34)(3.9x10^14)= 2.58x10^-19 J
What is the frequency of a wave whose wavelength is 5.25x10^-7 m? (include proper units in your answer)
c=λv -->v=c/λ=(3.00x10^8)/(5.25x10^-7)= 5.71x10^14 Hz
The atomic emission spectra uses which part of the Electromagnetic (EM) spectrum?
visible light
How does an electron become "excited"?
The electron absorbs energy and jumps to a higher energy level.
Why does each element have a different atomic emission spectra?
each element has a unique arrangement of electrons
What color of visible light has the smallest amount of energy? the greatest amount of energy?
smallest: red; largest: purple/pink
Visible light has a wavelength between _________ - __________ (approximately).
400 nm to 750 nm (4.00x10^-7 m to 7.50x10^-7 m)
What is the speed of light?
c = 3.00 x 10^8 m/s/s
What is Planck's constant?
h = 6.626 x 10^-34 Jxs
What formula would you use to solve the following problem?: Calculate the wavelength of an EM wave with a frequency of 5.00x10^14 Hz.
c=λv
What formula would you use to solve the following problem?: Calculate the energy of an EM wave with a frequency of 5.00x10^14 Hz.
E=hv
What is the symbol for energy?
E
What is the symbol for frequency?
v
What is the symbol for wavelength?
λ (lambda)
What is the unit for wavelength?
m
What is the unit for energy?
Joules (J)
What is the unit for frequency?
Hertz (Hz or 1/s or s^-1)
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