The bases (alkalis) The bases are the substances that dissociate in the water producing the negative hydroxide ions (OH–), Examples of some bases such as sodium hydroxide (the caustic soda) NaOH, calcium hydroxide (lime...
Types of the compounds There are a countless number of existing compounds, they can be classified according to their properties only into the acids, the bases (alkalis), the oxides and the salts.
The valency The valency is the number of electrons that an atom gains, loses or even shares during a chemical reaction, The valency is the number of electrons that an atom needs to gain or...
Lanthanides and actinides Lanthanides and actinides are located below the modern periodic table, They consist of two rows, They are known as the f-block elements because they have valence electrons in the f-shell, Lanthanides...
