Rigel
Phosphorus is the second element in the fifteenth column of the period table. It is classified as...
Book of Chemistry
Oxygen is an important element that is needed by most life forms on this planet to survive....
Nitrogen is the first element in column 15 of the periodic table. It is part of the...
Carbon is one of the most important elements to life on the human’s planet. It forms more...
Hydrogen is the first element in the periodic table. It is the simplest possible atom composed of...
Rho
This is the number of protons in each atom. Each element has a unique atomic number. Hydrogen...
An element is a pure substance that is made from a single type of atom. Elements are...
Aurora 
Doyen Altair 