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Electromagnetic Spectrum Flashcards

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1
Q

Decribe electromagnetic spectrum with higher to lower frequency. (higher to lower energy)

A

Gamma ray—X rays—UV—Visible light—IR—Microwaves—Radiowaves

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2
Q

Decribe electromagnetic spectrum with shorter to longer wavelength.

A

Gamma ray—X rays—UV—Visible light—IR—Microwaves—Radiowaves

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3
Q

Electromagnetic spectrum

A

Low energy radio waves to high energy gamma waves

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4
Q

Electron have _____ properties

A

wave

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5
Q

Electrons release energy when it____

A

moves from one orbital to another

^E electron= E photon

E photon=hv

^E electron=hv

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6
Q

Electrons release energy when it_____.

A

Move from one orbital to another

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7
Q

Emission light spectrum and absorption light spectrum, which can be used to guess the electronic configuration?

A

Emission spectrum ——> analyse ——> information about the electronic configuration of different atoms

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8
Q

Emission spectrum and absorption light spectrum,which can be used to guess the electronic configuration?

A

When an electron moves to higher energy from the lower energy level——->the spectrometer analyzes the transmitted radiation——->absorption

Emission spectrum-lines not appeared on the absorption spectrum and visible only when high voltage is applied

Emission spectrum____analyze_____information about the electronic configuration of different atoms

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9
Q

energy level and radiation

A

n=1,ultraviolet
n=2,visible light
n=3>above,infrared radiation

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10
Q

First ionization energy means____

A

The amount of energy released when one mole of electrons is removed from one mole of gaseous atoms in their ground state.

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11
Q

How absorption spectrum is produced?

A

When electromagnetic radiation pass through a collection of atoms some of the radiation is absorbed and used to excite the atoms from lower energy to higher level energy

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12
Q

How can we find the atomic mass of an element ?

A

Mass number = no of protons + no of neutrons = 1 amu+ 1amu ( approximately)

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13
Q

How does the element release energy?

A

When an atom absorbs energy, electrons move into an orbit or higher energy level from the nucleus———> excited state====> unstable and falls back into the ground state/ the energy the electrons give off when it falls to the lower levels is one photon in the form of electromagnetic radiation.

The energy is proportional to the frequency of the radiation*

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14
Q

How is the frequency and wavelength proportional to?

A

Inversely proportional
v = fλ

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15
Q

How the frequency is proportional to the wavelength ?

A

inversely proportional

V=f lambda

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16
Q

How wavelength,frequency & energy relate to?

A

Wavelength and frequency are inversely proportional.
(shorter wavelength—-higher frequency)

Frequency and energy are directly proportiona.
(High frequency—-high energy released)

Therefore,wavelength and energy are inversely proportional.
(Shorter wavelength—–higher frequency—-higher energy)

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17
Q

once the ionization energy is added to remove an electron from the atom, the electron is taken away from the nucleus and can be considered n=

A

infinity

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18
Q

Once the ionization energy is added to remove an electron from the atom, the electron is taken away from the nucleus and can be considered to be n= ———

A

Infinity

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19
Q

One element that does not have neutron

A

Hydrogen
1 H
1

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20
Q

Planck equation explanation

A

The energy of photon is equal to the energy of change in atom
^Eelectron=Ephoton

By Planck eq:Ephoton=hv

^Eelectron=hv

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21
Q

Relative atomic mass formula

A

(Relative abundance of an isotope* mass number + relative abundance of second isotope* mass number of 2nd isotope ) / the number of atoms

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22
Q

What electromagnetic radiation an atom can emit?

A

Infrared radiation

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23
Q

What is absorption spectrum?

A

The spectrum that shows when electron moves from higher energy level to lower energy level.

The absorption spectrum can be seen as blacklines in visible light spectrum.

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24
Q

What is emission spectrum?

A

The spectrum that shows when electron moves from lower energy level to higher energy level.

The emission spectrum can be seen as lines in black background. (visible only when hih voltage is applied)

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25
What is hydrogen like atom? What is the energy expression for hydrogen like atom?
Hydrogenလိုမျိုးoutermost shellမှာ one eပဲရှိတဲ့atomတွေကိုhydrogen like atom E=-kZ^2/n^2 (Z=nuclear charge,+1 for H,+2 for He,+3 for Li) k=2.178*10^-18J n=number of shells
26
What is the hydrogen like atom? What is the energy expression for hydrogen like atom?
hydrogen လိုမျိုး Outer Most Shell မှာ one ē ဘဲရှိတဲ့ atoms တွေကို hydrogen like atoms
27
What is the wavelegth of gamma rays?
10^-6 nm
28
What is the wavelength of radio waves?
10^8 nm
29
What is the wavelength range of visible light spectrum?
4 x 10^-7 to 7 x 10^-7 nm
30
What rays is released when electrons fall to n=1 level?
UV rays (Lymen series)
31
What rays is released when electrons fall to n=2 level?
Visible light spectrum (Balmer series)
32
What rays is released when electrons fall to n=3 level?
IR (Paschen serie)
33
What rays is released when electrons fall to n=4 and n=5 level?
IR (Bracket serie)
34
What will happen when atom absorb energy?
an electron moves from lower energy level (ground state) to higher energy level(excited state). But the excited state is unstable and the electron fall into ground state and giving off energy in the form of electromagnetic radiation (Photon). The energy released is proportional to frequency of the radiation
35
What would an electron do if it moves to a different orbit?
It would emit or absorb a proton if it moves to a different orbit
36
What would an electron do if it moves to different orbit?
It would emit or absorb a photin if it moves to different orbit ^E=hv=E1-E2=-k(1/n2^2-1/n1^2) h=6.6262*10^-34Js k=2.178*10^-18J
37
Which electromagentic radiation have longest wavelength?
Radio waves (Longest wavelegth,lowest frequency,Lowest energy)
38
Which electromagentic radiation have shortest wavelength?
Gamma rays (Shortest wavelegth,Highest frequency,highest energy)
39
Which electron transition involves the greatest release of energy? 1. n=2 to n=6 2. N=6 to n=4 3. N=1 to n=7 4. N= 3 to n=1 5. N=7 to n=2
Ans=4 (bcus n=1 Lowest energy level) Energy given out is maximum when the electron from the higher state falls into the lowest energy subshell. DO NOT DECIDE BY DIFFERENCE IN NUMBERS
40
Which electron transition involves the greatest release of energy? 1)n=2 to n=6 2)n=6 to n=4 3)n=1 to n=7 4)n=3 to n=1 5)n=7 to n=2
Ans:4 n1=UV n2=visible light n3=infrared n4=infrared n5=infrared therefore, energy given out is maximum when the electrons from the higher state falls into the lowest energy sub shell.DO NOT DECIDE BY DIFFERENCE IN NUMBERS
41
Which light of visible spectrum have highest energy?
Red
42
Which light of visible spectrum have highest energy?
Purple
43
Which light of visible spectrum have shortest wavelength?
Red (7 x 10^-7nm) Longest wavelength,lowest frequency and lowest energy
44
Which light of visible spectrum have shortest wavelength?
Purple (4 x 10^-7nm) Shortest wavelength,highest frequency and highest energy
45
Why do the lines converge at higher energies?
B/c energy levels inside the atom are closer together at higher energy eg.3d and 4s energy level are similar ____transition elements have variable oxidation numbers
46
Why do the lines coverage at higher energies?
Bcuz energy levels inside the atom are closer together at the higher energy Eg 3s and 4 d energy levels are similar——-> transition metals have variable oxidation numbers
47
Electromagnetic spectrum
Low energy radio waves to high energy gamma waves
48
What electromagnetic radiation an atom can emit?
Infrared radiation
49
How absorption spectrum is produced?
When electromagnetic radiation pass through a collection of atoms some of the radiation is absorbed and used to excite the atoms from lower energy to higher level energy
50
What will happen when atom absorb energy?
an electron moves from lower energy level (ground state) to higher energy level(excited state). But the excited state is unstable and the electron fall into ground state and giving off energy in the form of electromagnetic radiation (Photon). The energy released is proportional to frequency of the radiation
51
Planck equation explanation
The energy of photon is equal to the energy of change in atom ^Eelectron=Ephoton By Planck eq:Ephoton=hv ^Eelectron=hv
52
energy level and radiation
n=1,ultraviolet n=2,visible light n=3>above,infrared radiation
53
Electron have _____ properties
wave
54
What is ionization energy?
The energy needed to remove one mole of electrons from the ground state of one mole of the gaseous atom
55
What would an electron do if it moves to different orbit?
It would emit or absorb a photin if it moves to different orbit ^E=hv=E1-E2=-k(1/n2^2-1/n1^2) h=6.6262*10^-34Js k=2.178*10^-18J
56
What is hydrogen like atom? What is the energy expression for hydrogen like atom?
Hydrogenလိုမျိုးoutermost shellမှာ one eပဲရှိတဲ့atomတွေကိုhydrogen like atom E=-kZ^2/n^2 (Z=nuclear charge,+1 for H,+2 for He,+3 for Li) k=2.178*10^-18J n=number of shells
57
How the frequency is proportional to the wavelength ?
inversely proportional V=f λ
58
Electrons release energy when it____
moves from one orbital to another ^E electron= E photon E photon=hv ^E electron=hv
59
Which electron transition involves the greatest release of energy? 1)n=2 to n=6 2)n=6 to n=4 3)n=1 to n=7 4)n=3 to n=1 5)n=7 to n=2
Ans:4 n1=UV n2=visible light n3=infrared n4=infrared n5=infrared therefore, energy given out is maximum when the electrons from the higher state falls into the lowest energy sub shell.DO NOT DECIDE BY DIFFERENCE IN NUMBERS
60
Why do the lines converge at higher energies?
B/c energy levels inside the atom are closer together at higher energy eg.3d and 4s energy level are similar ____transition elements have variable oxidation numbers
61
Emission spectrum and absorption light spectrum,which can be used to guess the electronic configuration?
When an electron moves to higher energy from the lower energy level——->the spectrometer analyzes the transmitted radiation——->absorption Emission spectrum-lines not appeared on the absorption spectrum and visible only when high voltage is applied Emission spectrum____analyze_____information about the electronic configuration of different atoms
62
once the ionization energy is added to remove an electron from the atom, the electron is taken away from the nucleus and can be considered n=
infinity
63
What would an electron do if it moves to a different orbit?
It would emit or absorb a proton if it moves to a different orbit
64
What is the hydrogen like atom? What is the energy expression for hydrogen like atom?
hydrogen လိုမျိုး Outer Most Shell မှာ one ē ဘဲရှိတဲ့ atoms တွေကို hydrogen like atoms
65
Energy difference when the electron jump from one orbit to another is
E electron=E Photon
66
How to find the energy difference of the electron when they jump from one shell to another?
Eelectron=-R(1/nf^2-1/ni^2) r=-2.178x10^-18J
67
Planck's equation
E photon=hv h=6.6262*10^-34Js
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