Transcript Families of Elements Notes

Families of Elements
Lecture Notes
Periodic Table
Alkali Metals- Group 1
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Alkali metals have one valence electron which can easily be removed to form
a + 1 cation
Soft, and shiny metals that react violently with water
Very reactive and can cause burns
Reacts quickly with oxygen and therefore it is never found in its pure form
nature
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Sodium is Alkali metal found in table salt. Potassium is also found in this family.
Alkaline-Earth Metal- Group 2
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Alkaline earth metals have two valence electrons.
They may react with other elements to form +2 cations.
Less active than the Alkali Metals
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Calcium is Alkaline-Earth Metal found in shells of sea animals, and in bones and teeth.
Magnesium is used to build some airplanes, it is also found in Epsom salts, and milk of
magnesium.
Transition Metals – Groups 3-12
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Much less reactive then the Groups one and two.
They can lose electrons to form positive ions.
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Silver, gold, platinum, are often used in jewelry because they are shiny and like all metals
can be stretched and pounded into different shapes.
Copper is used in electrical wiring or plumbing.
Tungsten is used in light bulb filaments.
Iron, cobalt, copper, and manganese play a vital roles in body chemistry.
Boron Family- Group 13
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Elements in this family have three valence electrons
They may react with other elements to form +3 cations
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Boron is used in detergents
Aluminum is the most common metal in the Earth’s outer layer. Aluminum is also found
in cans, foil, and siding.
Carbon Family- Group 14
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Elements in this family contain 4 valence electrons.
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Carbon in its pure form is graphite or diamond, it combines with other elements to form
millions of carbon containing compounds. Carbon is found in all living substances and
in many synthetic.
Silicon is the second most abundant element in the Earth’s outer layer.
Tin is used to coat steel in making rust proof cans.
Nitrogen FamilyGroup 15
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Elements in this family have 5 valence electrons.
Elements in this family may react with other elements to form an anion with
–3 charge.
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Pure nitrogen exists as a gas. It combines with carbon, oxygen, and hydrogen to form
explosive compounds such as TNT. Its compounds are found in most fertilizers.
Nitrogen is found in amino acids and nucleic acids(DNA, RNA).
Phosphorus is a solid which can exist in yellow or red form. It is a basic part of organs
and bones.
Oxygen Family- Group 16
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Elements in this family have 6 valence electrons.
Elements in this family may react with other elements to gain 2 electrons to
form an anion with –2 charge.
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Oxygen is the most common element in the earth’s outer layer. It is basic for almost all
life forms. Pure oxygen exists as a gas and is very reactive.
Sulfur is a yellow solid and is used to make matches and rubber tires.
Selenium becomes a good conductor when it is exposed to light; makes it useful for solar
cells and light meters.
Halogen Family- Group 17
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Elements in this family have 7 valence electrons.
Halogens may react with other elements to gain an electron to form a –
1 anion.
This family reacts most readily with alkali metals to form white solids
known as salts.
Halogen compounds are commonly used in disinfectants and cleaning
agents.
 Fluorine compounds are used in toothpastes, insecticides and in the
preparation of some plastics.
 Bromine are used in drugs, photographic film, and in gasoline to
prevent engine knocking.
Noble Gas- Group 18
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Element in this family has eight valence electrons in the
outer most shell.
All elements in this family are gases.
Elements in this family are stable or inert and do not
interact with other elements. This is because their outer
energy level is full of electrons. Noble gas elements do not
lose or gain electrons to form ions.
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Helium is the lightest noble gas and the second most abundant element in
the universe. It does not burn and is used in balloons and blimps.
The other elements are used in lighting and welding.
Lanthanides and Actinides
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Lanthanide family begins with the element lanthanum, atomic number 57.
Some lanthanides are used in the production of steel and glass.
Actinide family begins with the element actinium, atomic number 89. All of
the actinides are radioactive they give off high energy particles.