Tiffany!

=An Atom= A unit of matter, the smallest unit of an element, consisting of a dense, central, positively charged nucleus surrounded by a system of electrons, equal in number to the number of nuclear protons, the entire structure having an approximate diameter of 10-8 centimeter and characteristically remaining undivided in chemical reactions except for limited removal, transfer, or exchange of certain electrons. []

=﻿The history of an atom= That depends on exactly what you mean by "discovered." Jainism had a concept of small particles similar to atoms in the 6th millennium BC, and either Democritus or his mentor Leucippus independently came up with the idea in the 5th century BC. However, these were essentially lucky guesses; there was no real scientific basis behind them, so saying these people "discovered" atoms is a pretty big stretch. The person most responsible would be John Dalton, who in the early 19th century thought that substances were composed of atoms, and even assigned relative weight values to several types of atom. []

=How was the atom discovered?= Democritus and Leucippus a 5th century thought that matter was made up of tiny,particles they called atom, or in Greek "a-tomos". The reason why they thought this is because nothing can come from nothing. Around 1803, John Dalton developed the first useful atomic theory of matter. He imagined the atom as a circle full of an electrically positive particles mixed together with negative electron. []

Atom Structures [] =﻿Different particles of an atom= [] =Where are they located?= [] =What make atom elements different?= []
 * Atoms are the basic units of chemistry
 * Made up of matter
 * composed of Protons, Electrons, and Neutrons
 * The Electrons are positivly charged
 * All the structures inside gathered inside, is called the Nucleus
 * Made up of three basic particles ,electrons, Protons, and neutrons
 * All gathered in the center called the neuclus.
 * a neucleus contains Protons and Neutrons
 * electrons gather around the Nucleus
 * ======The electrons gather and circle around the Nucleus======
 * The protons and nuetrons are gathered inside in the Nucleus
 * Three sub particles
 * 25 out of the 90 are living things
 * certain elements take up more space than others
 * some depend on the environment