The Atomic Theory notes PDF

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The Atomic Theory Chemistry The smallest piece of an element that maintains th atom. Individual atoms are extremely small. It wou row to make a line that is 1 cm long. The period at several million atoms in it. Atoms are so small that is made from atoms—but it is. The concept that atoms play a fundamental role in modern atomic theory, irst stated by John Dalton, consists of three parts: 1. All matter is composed of atoms. 2. Atoms of the same element are the same; ato 3. Atoms combine in whole-number ratios to form

These concepts form the basis of chemistry. Although the word atom comes from a Greek word understand now that atoms themselves are compo particles. The irst part to be discovered was the el a negative charge. It is often represented as e−, wi negative charge. Later, two larger particles were d massive (but still tiny) subatomic particle with a po neutron is a subatomic particle with about the sam is represented as either n or n0. We now know that composed of electrons, protons, and (with one exc

outside the nucleus and spend their time orbiting Figure 4.1 "The Structure of the Atom".) Figure 4.1 The Structure of the Atom

Atoms have protons and neutrons in the center, m orbit the nucleus. The modern atomic theory states that atoms of on...