أكاديميا - كولنز - معاجم الجيب العلمية - الكيمياء - انكليزي - فرنسي - عربي الحرف ٣_ i

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iron compounds
Composés mpl du fer

Iron compounds. The new form forms compounds with valency (II) and (III). Iron (II) compounds tend to be green in color, while iron (III) compounds are yellow or brown.

Iron (III) oxide Fe2O3 (hematite)

This compound is used as a yellowish-brown dye in the paper, linoleum and ceramic industries. It is used as a catalyst and polish, as is the case in jewelry polish red.

Iron chloride FeCI3

This compound is produced by the interaction of elements with each other. It is an important intermediate, and is also used in water purification and in the manufacture of pharmaceutical materials.


FeSO4.7H2O
(II) Iron sulphate

. Iron(II) sulfate can be extracted from waste materials left over from electroplating processes. It is an important compound used in wood preservation, inks, and lithography.


isomer
Isomère m

superimposed. Isomer. When two or more different compounds have the same molecular formula, these compounds are described as isomers.
Because the compounds are different, they have different properties.
Example :
Formula C2H6O
Structure of the two compounds
Metoxy Matan
Ethanol



isotopes
isotopes mpl

Isotopes. Elemental atoms always contain the same number of protons (the same atomic number). The number of neutrons in the atoms of an element can be different (mass number).
Different )

A sample of chlorine contains 18 atoms
Neutrons (76% of the total). Atoms with 20 neutrons (24% of the total). Therefore, chlorine has two isotopes:

35/17CI

37/17CI

Thus, isotopes contain atoms of the same element
Different numbers of neutrons.
The ratio of isotopes always remains constant. Most elements exist in isotopic forms. Here are some examples:

Isotopes

Bromine Br (51%) - Br (49%)

Carbon C (99%) - C (1%)

Copper Cu (31%) - Cu (69%)

Magnesium Mg (11%) - Mg (79%)
Mg(10%)

All of the above isotopes are stable isotopes. But there are many other unstable and radioactive isotopes. There are a few elements that do not have isotopes, that is, the number of neutrons in their atoms does not change, such as:

Fluorine
Manganese
gold
Phosphorus
iodine
Scandium

The existence of isotopes explains the large number of elements that have a relative atomic mass that is not close to an integer, for example CI = 35.5.