Aury Mรกrquez 49 Carolina Torres 49 Nancy Uzcategui 49 Ivana Navas 49
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LEUCIPO
DEMOCRITUS
The atomistic philosophy of Leucippus and Democritus could be summarized as: 1.-The atoms are eternal, indivisible, homogeneous and invisible. 2.-The atoms differ in shape and size. 3.-The properties of matter vary grouping of atoms.
AIR
WATER
FIRE
EARTH EMPEDOCLE IV b.C
In the fourth century. BC, Empedocles postulated that matter consisted of four elements: earth, air, fire and water
Aristotle subsequently postulated that matter was made up of those 4 elements but denies the idea of ​atom, a fact that was maintained until 200 years later in the thinking of mankind.
In 1808, John Dalton 1.-The elements are composed of tiny, indivisible particles called atoms and unalterable. Dalton established a system for designating each atom so that could distinguish between different elements
The electron commonly represented by the symbol e, is a subatomic particle with a negative elementary charge
The particle nature of the electron was demonstrated for the first time with a Crookes tube. In this illustration, an electron beam profile projected crossshaped target against the tube face
he is a subatomic particle with a positive electric charge elementary
The neutron is a subatomic particle, a nucleon, no net charge present in the atomic nucleus of virtually all atoms except protium.
All bodies are composed of Atoms
ATOMIC BOMB
An atomic bomb is a device that gets a lot of explosive energy nuclear reactions. Its operation is based on a nuclear trigger uncontrolled chain reaction
the atomic bomb is composed of millions of atoms of uranium
The electron was discovered by JJ Thomson in 1897 at the Cavendish Laboratory at Cambridge University, studying the behavior of cathode rays.
The neutron was first identified in 1932 by the British physicist James Chadwick
Proton existence was first tested by Ernest Rutherford
water molecule
iron molecule
Salt molecule
titanium molecule
FIRST IMAGE OF A REAL ATOM
In the following we present an example of image creating a quantum "pen" by displacement of iron atoms on a surface of cobalt.
Images of molecules from a microscope