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MCAT Flashcards > Atomics Structure & Periodic Trends > Flashcards

Atomics Structure & Periodic Trends Flashcards

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MCAT flashcards
1
Q

What is a molecule?

A

When two or more atoms join together

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2
Q

What is a compound?

A

A molecule composed of multiple different elements

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3
Q

Protons

A 
Carry a positive charge (approx. 1.6 x 10-19 coulombs (C)) = elementary charge (e)
1 atomic mass unit (amu) or 1 Da
A nucleon (b/c resides at the nucleus of an atom)
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4
Q

Neutrons

A

Slightly more than 1 amu, but we estimate as 1 amu

A nucleon

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5
Q

Electrons

A

Super small, mass negligible
-1.6 x 10-19 C, so the reverse sign but same magnitude as a proton
Held close to nucleus but not nucleons
Exist in electron cloud around nucleus of an atom

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6
Q

Atomic Number

A

Termed Z
The same as the number of protons in an atom
Gives an atom it’s identity

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7
Q

Mass Number

A

Termed A

Total of neutrons and protons in a nucleus

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8
Q

How are atomic and mass numbers typically represented for an element?

A

Mass number is on top, atomic on bottom

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9
Q

What are the common isotopes of Hydrogen? What form are we most familiar with?

A

Common = Protium
Isotopes = Deuterium (mass = 2), Tritium (mass=3)
Deuterium will be labeled D if it’s a hydrogen that has been weighted for tracking in a reaction

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10
Q

Difference between Atomic Weight and Atomic Mass

A

Atomic weight = average of all different isotopes of an element
Atomic mass = mass number, so mass of one particular element

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11
Q

Cations

A

Ions that carry a net positive charge (due to losing an electron)
Electron deficient, proton rich

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12
Q

Anions

A

Ions that carry a net negative charge (due to gaining electrons)
Electron rich

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13
Q

Fe^2+

A

Ferrous Ion

Iron (II)

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14
Q

Fe^3+

A

Ferric ion

Iron (III)

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15
Q

H-

A

Hydride

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16
Q

O^2-

A

Oxide

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17
Q

ClO-

A

Hypochlorite

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18
Q

NO2-

A

Nitrite

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19
Q

NO3-

A

Nitrate

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20
Q

ClO4-

A

Perchlorate

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21
Q

ClO2-

A

Chlorite

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22
Q

ClO3-

A

Chlorate

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23
Q

CO3^2-

A

Carbonate

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24
Q

PO4^3-

A

Phosphate

25
Q

HCO3-

A

Hydrogen carbonate

26
Q

H2PO4-

A

Dihydrogen phosphate

27
Q

How does electron pull determine energy/stability?

A

Electrons that are pulled closer to the nucleus have greater attractive force and are more stable
Greater stability means lower energy level of that electron
Less stability means further away from nucleus and higher energy level

28
Q

How do atoms release energy?

A

Electrons can move from lower energy states to higher if they absorb energy.
In reverse, this can mean they move from high to low and emit energy (emit a photon)
Emitted energy will be in the form of electromagnetic radiation - this could include visible light, gamma rays, etc.

29
Q

How do we determine the energy of the electromagnetic radiation?

A 
E = hf
H = Planks constant, equal to 6.63 x 10^-34 J.s
f = frequency of light
30
Q

How do we determine frequency of light (f)?

A

Take the speed of light and divide by it’s wavelength
Speed of light is 3.00 x 10^8 m/s (in a vacuum) or c
f = c/lambda

31
Q

How do we calculate the amount of energy an electron holds at a certain energy level?

A 
E = - R/n^2
R = 2.18 x 10*-18 J
32
Q

How do we calculate the energy emitted or absorbed when an electron moves to a new energy level?

A

hc/lambda = R(1/n(final)^2 - 1/n(initial)^2) = change of energy

33
Q

What is the principal quantum number?

A

Corresponds to the energy level of the electron

The principal quantum number corresponds to the row (period) of the table that the element is found

34
Q

What is the azimuthal number?

A

Describes the angular momentum and shape of orbit of an electron
Also known as the subshell of the principal quantum number
Can never be greater than n - 1 or less than 0.
denoted as l, but the number than l is equal to determines the subshell
so if l = 0, it’s the s subshell
l = 1, p subshell
l = 2, d subshell
l = 3, f subshell
The types of subshells have different shapes, so
s = sphere
p = dumbbell
d and f = more complex

35
Q

How do we determine spacial orientation of orbital within subshell?

A 
Magnetic quantum number - gives you the number of orbitals for a given subshell
Each orbital can hold up to 2 electrons
s = 0
p = -1, 0, 1
d = -2, -1, 0, 1, 2
f = -3, -2, -1, 0, 1, 2, 3
36
Q

Spin quantum number

A

Relates to angular momentum - how is the electron moving/oriented within the orbital?
can be -1/2 or 1/2
Two electrons in the same orbital would have the same subshell (so azimuthal number) and magnetic quantum number, but opposite spin quantum numbers

37
Q

What are exceptions to the Aufbau principal?

A

Cr and Cu
These don’t have full s orbitals, instead the electrons reside in the p oribals to for [Ar]4s13d5 and [Ar]4s13d10 respectively

38
Q

What are traits of group 1 on the periodic table?

A

Alkali metals
include Li, Na, K
Highly reactive - will easily donate their valence electron to form +1 cations

39
Q

Traits of group 2 elements

A

alkaline earth metals
Mg, Ca
will donate 2 valance to form 2+ cations
in solid state are reactive

40
Q

Traits of group 3-12

A

transition metals

hard, durable metals, easily conduct electricity, take on vivid colors due to electron transitions btwn d orbitals

41
Q

What are metalloids

A

share traits of metals and nonmentals
semiconductors
brittle
Ex: Boron, silicon

42
Q

Group 13 Traits

A

Some semimetals and some metals

Boron = semimetal, the rest are metals

43
Q

Group 14 Traits

A

Belong to the carbon family
have nonmental and metal properties
can form oxides
have 4 valence electrons

44
Q

Group 15 Traits

A

Elements of the nitrogen family
5 valence electrons
properties of nonmetals and metals

45
Q

Group 16 Traits

A

Chalcogens
include O and S
mostly non-metal characteristics
6 valence, nearly full so they react w/ other elements to form 2- anions

46
Q

Group 17 Traits

A

Halogens
v reactive - want to gain their last electron to have a full valence shell
Non-metals

47
Q

Group 18

A

Nobel gases
non-metallic, unreactive due to full valence shell
low boiling points

48
Q

How does attractive force of nucleus on valence electrons change across periodic table?

A

Zeff = the effective nuclear charge
Zeff increases from left to right across the table (atomic number increases, more protons)
Thus, atomic radius decreases from left to right (more charge to pull in electrons)
However, atomic radius increases from top to bottom of the table, because principal quantum number increases (more shells between nucleus and valence electrons)
largest radii elements are in the bottom left of the table

49
Q

What is ionic radius?

A

The radius of the ion form of an element
Cation forms of atoms have a smaller ionic radius than the atomic radius
Anion forms of atoms have a larger ionic radius than the atomic radius

50
Q

What is ionization energy?

A

The amount of energy required to remove an electron (and form an ion)
Ionization energy increases as Zeff increases (b/c greater Zeff means you hold electrons more tightly, so takes more energy to remove)

51
Q

What is electron affinity?

A

Amount of energy released when an electron is added to an electron
increases as Zeff increases (exception is noble gases), also decreases top to bottom of the table

52
Q

What is electronegativity?

A

Tendency for an atom to attract electrons that are shared in a chemical bond btwn two atoms
High electron affinity means high electronegativity, so this also increases as Zeff increases, but decreases down the table (top to bottom)

53
Q

2 e rich, 2 bonded atoms, 0 lone

A

Linear, 180

Ex: co2

54
Q

3 e rich, 3 bonded atoms, 0 lone

A

Trigonal planar, 120

Ex: BF3

55
Q

4 e rich, 4 bonded atoms, 0 lone

A

Tetrahedral, 109.5, ch4

56
Q

4 e rich, 3 bond, 1 lone

A

Trigonal pyramidal, 107, nh3

57
Q

4 e rich, 2 bond, 2 lone

A

Bent, 104.5, h2o

58
Q

5 e rich, 5 bond, 0 lone

A

Trigonal bipyramidal, 90, 120, 180

59
Q

6 e rich, 6 bonds, 0 lone

A

Octahedral, 90, 180

MCAT Flashcards (23 decks)

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