Tagged: The nonmetals

February 1, 2015

What is the ionic bond? & the characteristics of the ionic compounds

The element is composed of the molecules, Each molecule consists of the atoms, the atom is electrically neutral in its ordinary state (In the atom, the number of the electrons equals the number of...

The Matter

September 5, 2014

Attempts of elements classification, Mendeleev, Moseley & Modern periodic table

The elements The scientists classified the elements according to their properties to facilitate their study and to find a relationship between the elements, and their chemical and physical properties.