History and Methods of science Essay

Isotope, one or two or more species of atom having the akin atomic second, hence constituting the same component part, but disaccording on mass number. As atomic number is equivalent to the number of protons in the nucleus, and mass number is the sum total of the protons plus the neutrons in the nucleus, isotopes of the same element differ from one another only in the number of neutrons in their nuclei. kickoff Isotope, Microsoft Encarta 2006 (DVD), Redmond, WA Microsoft Corporation 2005.Atom, tiny basic building block of matter. altogether the material on earth is composed of various combinations of atoms. Atoms are the smallest particles of a chemical substance element that still exhibit all the chemical properties peculiar to that element. A row of 100 million atoms would be only around a centimeter long. Understanding atoms is key to understanding the physical world. much than 100 dissimilar elements exist in nature.Each with its own whimsical atomic makeup. The atoms of these elements react with one another and combine in different ways to blueprint a virtually unlimited number of chemical compounds. When two or more atoms combine, they form a molecule. For example, two atoms of the element hydrogen (H) combine with one atom of the element oxygen (O) to form a molecule of water. Source Atom, Microsoft Encarta 2006 (DVD), Redmond, WA Microsoft Corporation 2005.