Atom (English)
ATOM Atom is the smallest unit of matter, which consists of characteristic properties of chemical elements. It's a basic building block of chemistry. History of Atom The existence of atoms has been proposed since the time of early Indian and Greek philosophy in 400 BC, which was of the view that atoms are fundamental building blocks of matter. The word atom has been derived from the Greek word a-tomio which means uncuttable (or) non-divisible. Fig : 01 Structure of Atom In modern scientific usage, the atom is composed of various Subatomic Particles. Most of the atom is empty space. The rest consists of a positively charged nucleus of Protons and Neutrons surrounded by a cloud of negatively charged electrons. The nucleus is small and dense compared with the electron which are the lightest charged particles in nature. Fig : 02 Dalton Theory In 1808, Dalton proposed a theory on the atom called as Atomic theory of matter. According...