1 Atomic Structure Flashcards

1
Q

valence electrons

A

outermost shell of electrons –> higher energy

have strongest interactions with surroundings

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2
Q

isotopes

A

varying mass numbers

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3
Q

atomic weight

A

weighted average of different, naturally occurring, isotopes

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4
Q

Avogadro’s number

A

1 mole = number of whatever “things” one is concerned about

= 6.02 x 10^23

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5
Q

Planck relation

A

energy omitted as electromagnetic radiation from matter

comes in discrete bundles called quanta

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6
Q

Planck’s equation

A

E = hf

h = Planck’s constant = 6.626 x 10^(-34) J s

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7
Q

Bohr’s model

A

angular momentum of electrons orbiting hydrogen nucleus

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8
Q

Bohr’s equation

A

L = n h / 2 pi

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9
Q

energy of electron orbiting hydrogen nucleus

A

E = -R(H) / n^2

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10
Q

ground state

A

state of lowest energy of atom
(all electrons in lowest possible orbitals)

all systems tend towards minimal energy)

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11
Q

excited state

A

at least 1 electron moves to subshell of higher than normal energy

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12
Q

atomic emission spectra

A

fingerprints of electron transition

identifies element by line spectra

application of Bohr’s model

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13
Q

equation for energy of emitted photon

A

E = hc / lambda = -R(H) [(1/n(i)^2) - (1/n(f)^2)]

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14
Q

atomic absorption spectra

A

at specific wavelengths
accurate to make electro transition to “excited”
also a fingerprint (element-specific)

required when element is in gas phase

application of Bohr’s model

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15
Q

orbitals

A

electrons move rapidly around nucleus – localized to regions

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16
Q

Heisenberg Uncertainty Principle

A

impossible to determine simultaneously, accurately, both momentum AND position of electron

IF want position, electron must stop (no momentum)
IF want momentum, electron must move (lose position)

17
Q

Pauli Exclusion Principle

A

no two electrons in a given atom can possess the same 4 quantum numbers

18
Q

principle quantum number (n)

A

shell

increasing n increases energy level and radius of shell

19
Q

max number of electrons within shell

20
Q

azimuthal (angular momentum) quantum number (l)

A

shape and number of subshells

any value 0 to (n-1)

21
Q

max number of electrons within subshell

22
Q

magnetic quantum number (m(l))

A

specifies orbital

any value -l to l

23
Q

spin quantum number (m(s))

A

+(1/2) or -(1/2)

paired spins –> same orbital
parallel spins –> different orbitals

24
Q

Aufbau Principle

A

building-up principle

each subshell fills completely before electrons begin filling next one

25
Hund's rule
orbitals filled first with maximum number of parallel spins before paired spins (electron repulsion)
26
paramagnetic material
atoms with unpaired electrons, will orient spins in alignment with magnetic field attraction
27
diamagnetic material
atoms with only paired electrons | slightly repelled by magnetic field