Classification of mammals according to kind and number of teeth
The mammals The mammals are classified according to the kind and the number of teeth into the edentates mammals (The teethless mammals), and the mammals having teeth.
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Graduation of metallic and nonmetallic property in the modern periodic table
Modern periodic table In the modern periodic table, each period starts with the strong metal (in group 1 (1 A), where the metallic property decreases by increasing the atomic number, till we reach the...
Ways to protect living organisms from Extinction & Important word protectorates
The awareness of protecting natural life increased after great harmful consequences that appeared since the mid-twentieth century. As each species of the plant gets extinct, 30 species of animals that rely on it as...
Chemical properties of non-metals in modern periodic table
Non-metals The non-metals are the elements that have more than four electrons in their outermost energy levels, The non-metals are characterized by the smallest atomic sizes and the largest electronegativity.