The metals Metals are the elements that have less than four electrons in their outermost energy levels, During the chemical reactions, the atoms of the metallic elements tend to lose their outermost electrons, and...
The Red List The Red List is a list issued by the international union for conservation of nature (IUCN) every year, and indicates the endangered species, and the endanger level of each case, The...
If you go to the zoo, you will see a lot of different animals with different characteristics, and there is a variety among these animals in the shape and the way of feeding.
Electronegativity is the ability of the atom in the covalent molecule to attract the electrons of the chemical bond towards itself, There is an inverse relationship between the atomic size of the atom of...
