looking at the elements how does the table work. metals and non-metals the table contains a stair...
TRANSCRIPT
Looking at the Elements
How Does the Table Work
Metals and Non-Metals
The table contains a stair division on the right side of the table.
The elements to the left of this line are METALS except Hydrogen.
The elements to the right of the line are the NONMETALS. Many of these are gasses. The solids, such as carbon are very brittle and easily crushed.
Metals and Non-Metals
The properties of the elements change gradually as they move from left to right.
On either side of the stair step line are the metalloids.
Elemental Families.
Elements found in the same column of the periodic table are said to belong to the same FAMILY or GROUP.
Elements are grouped into the same families because they have similar properties.
Some Important Families.
Family 1 The Alkali Metals
These are very soft metals. They all contain one electron on
their outer energy level. This makes them highly reactive
and must be stored under oil to prevent a reaction with the air
Family 1 The Alkali Metals
They are NEVER found uncombined in nature.
They will react immediately with air, water, etc.
The most reactive of these would be francium because its' outer level is the farthest away from the pull of the nucleus.
Family 1 The Alkali Metals
Alkali metals and the compounds that contain them are widely used.
The salt used to season food and the rock salt used on roads contain sodium.
Sodium also plays a large part in the production of glass..
Family 2 The Alkaline Earth Metals
These metals are not quite as reactive as the Alkali metals but they are also not found uncombined in nature.
The compounds that they form are found in powders, plasters and cements and are widely used in industry.
Family 2 The Alkaline Earth Metals
. When an Alkaline earth metal dissolves in the ground water it produces hard water.
Hard water contains many dissolved minerals essential for good health
It also creates many problems for water works companies because it will deposit on pipes and equipment.
Family 17The Halogens
These elements are called the salt forming family. "Halogen" comes from the Greek word meaning "Salt-makers".
They only require one electron to complete their outer energy level and become inert.
Fluorine is the most reactive of these non-metals because it's outer level is very close to the nucleus and the attraction is great.
Family 17The Halogens
The uses of Halogens and their compounds are wide spread.
A chlorine based compound is used in pools and disinfectant bleaches.
Fluorine compounds are used in dental health.
Teflon is a fluorine compound that forms non-stick coating for cookware and skis.
Family 18The Nobel Gases
These elements were once thought to be absolutely unreactive, however they can be forced to react under extreme conditions.
They do not react because their outer most lever already contains 8 electrons.
Family 18The Nobel Gases
Helium is used to fill airships and weather balloons.
Light bulbs and some newly produced windows contain argon gas.
Neon gas will produce a bright light when an electrical current is passed through it.
The Transition Elements These elements are found in families 3-12. The
are sometimes referred to as the "heavy metals" because of their high densities.
These elements are used either alone or as alloys to produce our most commonly used structural metals.
A few transition metals, like copper can occur naturally, but most occur in compounds called ORES from which the metals can be extracted.
Their electron configuration is not as clear as with the other families.
They contain partially filled energy levels.
Synthetic Elements
You could take apart Earth, piece by piece, but you would never find even the slightest trace of an element called promethium.
Promethium is a synthetic element, one that is produced only in a laboratory.
Like all synthetic elements promethium is radioactive.
Lanthanides and Actinides
Promethium belongs to a part of the periodic table known as the lanthanide series.
These elements share the similar chemical properties.
The same istrue of the elements belonging to the actinide series.
Most of the synthetic elements are found in the actinide series and are known as transuranium meaning "beyond uranium".
Lanthanides and Actinides
The first transuranium element created was called neptunium because Neptune was the nest planet after Uranus.
Later that year another element was discovered and named plutonium.
Hmmm….I wonder why they called it that?