fe valency

A transition element and there-fore shows variable valency. It shows valency of +2 and forms divalent ions Fe 2 + (ferrous ions) and valency of +3 and forms trivalent ions Fe 3 + (ferric ions). The compounds of divalent ions are called ferrous ..

>-ous , and the one with the higher valency, ends as -ic . Lower Valency Higher Valency Cuprous Cu+ Cupric Cu++ Ferrous Fe++ Ferric Fe+++ Plumbous Pb++ Plumbic Pb++++ Mercurous Hg+ Mercuric Hg++ Aurous Au+ Auric Au+..

The name of the element that occurs first in the compound is written first without any change in its spelling. In naming MgO, the first part of the formula is magnesium. If the metal has a variable valency the Roman numeral is included. For example: FeO would be named as iron (..

When an atom donates one, two or three electrons from its valence shell to another atom, which has the ability to accept these electrons, it is known as electrovalency. As a result of electrovalency, both these atoms achieve the structure of an inert gas. When the chemical bond occurs by..

'd' block elements have valence electrons in both their outermost and penultimate shells. Valence electrons belonging to the outermost shell or both shells may take part in a chemical reaction. Accordingly, more than one oxidation state can be shown by the same element; this i..

Chlorine belongs to group VII A. Members of this group are called halogens which means 'salt producers'. Chlorine is a greenish yellow gas. Chlorine has seven electrons in its outer most shell and so has a valency of 1. Like other halogens chlorine is a strong oxidising agent. ..

The following types of compounds or species are Lewis acids: All molecules possessing an atom with incomplete octet of electrons or Lewis acids. Examples: BF 3 , AlCl 3 All cations are Lewis acids, Examples: Ag + , Cu 2 + , Fe 2 + , Fe 3 + etc. are Lewis acids. ..

Coagulation or Flocculation - Coagulation is the process by which a colloid precipitates out of a solution. The precipitation is brought about by induced aggregation. For e.g., an iron (III) hydroxide sol can be made to aggregate by addition of an ionic solution. A positively charged particle of ir..

Summary - Oxygen and sulphur belong to group VI A. Oxygen shows a valency of -2, while sulphur shows a valency of -2, +4 and +6. Industrially oxygen is manufactured by fractional distillation of liquid air free of dust particles and CO 2 . Oxides of mercury, silver and lead deco..

Although most metals are usually electropositive in nature and lose electrons in a chemical reaction they do not react with the same vigour or speed. Metals display different reactions towards different substances. The greater the ease with which an element loses its electrons and acquires a posit..