Periodic Trends - Dr. Hall's Science...
Transcript of Periodic Trends - Dr. Hall's Science...
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Periodic Trends
Elemental Properties and Patterns
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History of the Periodic Table • 1871 – Mendeleev arranged the elements
according to: • Increasing atomic mass • Elements w/ similar properties were put in the
same row • 1913 – Moseley arranged the elements
according to: • Increasing atomic number • Elements w/ similar properties were put in the
same column
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The Periodic Law
• Dimitri Mendeleev was the first scientist to publish an organized periodic table of the known elements.
• He was perpetually in trouble with the Russian government and the Russian Orthodox Church, but he was brilliant never-the-less.
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The Periodic Law
• Mendeleev even went out on a limb and predicted the properties of 2 at the time undiscovered elements.
• He was very accurate in his predictions, which led the world to accept his ideas about periodicity and a logical periodic table.
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The Periodic Law
• Mendeleev understood the ‘Periodic Law’ which states:
When arranged by increasing atomic number, the chemical elements display a regular and repeating pattern of chemical and physical properties.
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The Periodic Law
• Atoms with similar properties appear in groups or families (vertical columns) on the periodic table.
• They are similar because they all have the same number of valence (outer shell) electrons, which governs their chemical behavior.
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Valence Electrons
• Do you remember how to tell the number of valence electrons for elements in the s- and p-blocks?
• How many valence electrons will the atoms in the d-block (transition metals) and the f-block (inner transition metals) have?
• Most have 2 valence e-, some only have 1.
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A Different Type of Grouping
• Besides the 4 blocks of the table, there is another way of classifying element: • Metals • Nonmetals • Metalloids or Semi-metals.
The following slide shows where each group is found.
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Metals, Nonmetals, Metalloids
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Metals, Nonmetals, Metalloids
• There is a zig-zag or staircase line that divides the table.
• Metals are on the left of the line, in blue.
• Nonmetals are on the right of the line, in orange.
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Metals, Nonmetals, Metalloids
• Elements that border the stair case, shown in purple are the metalloids or semi-metals.
• There is one important exception.
• Aluminum is more metallic than not.
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Metals, Nonmetals, Metalloids
• How can you identify a metal? • What are its properties? • What about the less common nonmetals? • What are their properties? • And what the heck is a metalloid?
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Metals
• Metals are lustrous (shiny), malleable, ductile, and are good conductors of heat and electricity.
• They are mostly solids at room temp.
• What is one exception?
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Nonmetals
• Nonmetals are the opposite.
• They are dull, brittle, nonconductors (insulators).
• Some are solid, but many are gases, and Bromine is a liquid.
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Metalloids • Metalloids, aka semi-metals
are just that. • They have characteristics of
both metals and nonmetals. • They are shiny but brittle. • And they are
semiconductors. • What is our most important
semiconductor?
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Periodic Trends
• There are several important atomic characteristics that show predictable trends that you should know.
• The first and most important is atomic radius.
• Radius is the distance from the center of the nucleus to the “edge” of the electron cloud.
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Atomic Radius
• Atomic Radius – size of an atom
(distance from nucleus to outermost e-)
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Atomic Radius Trend • Group Trend – As you go down a column,
atomic radius increases • As you go down, e- are filled into orbitals that
are farther away from the nucleus (attraction not as strong)
• Periodic Trend – As you go across a period (L to R), atomic radius decreases • As you go L to R, e- are put into the same
orbital, but more p+ and e- total (more attraction = smaller size)
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Atomic Radius • The effect is that the more positive nucleus
has a greater pull on the electron cloud.
• The nucleus is more positive and the electron cloud is more negative.
• The increased attraction pulls the cloud in, making atoms smaller as we move from left to right across a period.
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Effective Nuclear Charge
• What keeps electrons from simply flying off into space?
• Effective nuclear charge is the pull that an electron “feels” from the nucleus.
• The closer an electron is to the nucleus, the more pull it feels.
• As effective nuclear charge increases, the electron cloud is pulled in tighter.
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Atomic Radius • The overall trend in atomic radius looks like
this.
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Atomic Radius
• Here is an animation to explain the trend.
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Shielding
• As more PELs are added to atoms, the inner layers of electrons shield the outer electrons from the nucleus.
• The effective nuclear charge (enc) on those outer electrons is less, and so the outer electrons are less tightly held.
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Ionization Energy • This is the second important periodic trend. • If an electron is given enough energy (in the
form of a photon) to overcome the effective nuclear charge holding the electron in the cloud, it can leave the atom completely.
• The atom has been “ionized” or charged. • The number of protons and electrons is no
longer equal.
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Ionization Energy • The energy required to remove an electron
from an atom is ionization energy. (measured in kilojoules, kJ)
• The larger the atom is, the easier its electrons are to remove.
• Ionization energy and atomic radius are inversely proportional.
• Ionization energy is always endothermic, that is energy is added to the atom to remove the electron.
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Ionization Energy
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Ionization Energy • Group Trend – As you go down a column,
ionization energy decreases • As you go down, atomic size is increasing (less
attraction), so easier to remove an e-
• Periodic Trend – As you go across a period (L to R), ionization energy increases • As you go L to R, atomic size is decreasing (more
attraction), so more difficult to remove an e- (also, metals want to lose e-, but nonmetals do
not)
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Ionization Energy (Potential)
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Electron Affinity
• Electron affinity is the energy change that occurs when an atom gains an electron (also measured in kJ).
• Where ionization energy is always endothermic, electron affinity is usually exothermic, but not always.
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Electron Affinity
• Electron affinity is exothermic if there is an empty or partially empty orbital for an electron to occupy.
• If there are no empty spaces, a new orbital or PEL must be created, making the process endothermic.
• This is true for the alkaline earth metals and the noble gases.
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Electronegativity Trend
• Group Trend – As you go down a column, electronegativity decreases • As you go down, atomic size is increasing, so less
attraction to its own e- and other atom’s e-
• Periodic Trend – As you go across a period (L to R), electronegativity increases • As you go L to R, atomic size is decreasing, so there is
more attraction to its own e- and other atom’s e-
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Electron Affinity
+ +
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Metallic Character • This is simple a relative measure of how
easily atoms lose or give up electrons.
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Metallic Character • Properties of a Metal
• Easy to shape • Conduct electricity • Shiny
• Group Trend – As you go down a column, metallic
character increases • Periodic Trend – As you go across a period (L to
R), metallic character decreases (L to R, you are going from metals to non-metals
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Electronegativity • Electronegativity is a measure of an atom’s
attraction for another atom’s electrons. • It is an arbitrary scale that ranges from 0 to 4.
• Generally, metals are electron givers and have low electronegativities.
• Nonmetals are are electron takers and have high electronegativities.
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Electronegativity
0
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Overall Reactivity
• This ties all the previous trends together in one package.
• However, we must treat metals and nonmetals separately.
• The most reactive metals are the largest since they are the best electron givers.
• The most reactive nonmetals are the smallest ones, the best electron takers.
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Reactivity • Reactivity – tendency of an atom to react
• Metals – lose e- when they react, so metals’ reactivity is based on lowest Ionization Energy (bottom/left corner) Low I.E = High Reactivity
• Nonmetals – gain e- when they react, so nonmetals’ reactivity is based on high electronegativity (upper/right corner)
High electronegativity = High reactivity
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Overall Reactivity
0
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The Octet Rule • The “goal” of most atoms (except H, Li and
Be) is to have an octet or group of 8 electrons in their valence energy level.
• They may accomplish this by either giving electrons away or taking them.
• Metals generally give electrons, nonmetals take them from other atoms.
• Atoms that have gained or lost electrons are called ions.
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Ions • When an atom gains an electron, it becomes
negatively charged (more electrons than protons ) and is called an anion.
• In the same way that nonmetal atoms can gain electrons, metal atoms can lose electrons.
• They become positively charged cations.
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Ionic Radius
• Cations are always smaller than the original atom. • The entire outer PEL is removed during
ionization.
• Conversely, anions are always larger than the original atom. • Electrons are added to the outer PEL.
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Cation Formation
11p+
Na atom
1 valence electron
Valence e- lost in ion formation
Effective nuclear charge on remaining electrons increases.
Remaining e- are pulled in closer to the nucleus. Ionic size decreases.
Result: a smaller sodium cation, Na+
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Anion Formation
17p+
Chlorine atom with 7 valence e-
One e- is added to the outer shell.
Effective nuclear charge is reduced and the e- cloud expands.
A chloride ion is produced. It is larger than the original atom.
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Ionic Radius Trend Metals – lose e-, which means more p+ than e- (more attraction) SO… Cation Radius < Neutral Atomic Radius
Nonmetals – gain e-, which means more e- than p+ (not as much attraction) SO… Anion Radius > Neutral Atomic Radius
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Ionic Radius Trend • Group Trend – As you go down a column, ionic
radius increases • Periodic Trend – As you go across a period (L to
R), cation radius decreases, anion radius decreases, too.
As you go L to R, cations have more attraction (smaller size because more p+ than e-). The anions have a larger size than the cations, but also decrease L to R because of less attraction (more e-
than p+)
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Ionic Radius
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Ionic Radius How do I remember this????? The more electrons that are lost, the greater the reduction in size.
Li+1 Be+2
protons 3 protons 4 electrons 2 electrons 2
Which ion is smaller?
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Ionic Radius How do I remember this??? The more electrons that are gained, the greater the increase in size.
P-3 S-2
protons 15 protons 16 electrons 18 electrons 18
Which ion is smaller?