1. Democritus Abdera 460-370 B.C. He first attempted to create materialism. Everything is composed of atoms . 2. Antione Lavoisier 1772 Total mass of a product of a chemical…

Slide 1 Slide 2 Summary of the Atom atoms are the smallest particles that can be uniquely associated with an element Atoms cannot break down further by chemical means. each…

Slide 1Particles in the Atom Each element is chemically unique. To understand why they are unique, you need to know the structure of the atom (the smallest particle of an…

1.Rutherford and the nucleus British physicist who, in 1911, proved that atoms had a small, dense, positively charged nucleus. Rutherford’s ModelProtons ( the positively…

1.Atoms:Development ofthe AtomicTheory2. Democritus 460 BC - Greek philosopher proposesthe existence of the atom He pounded materials until he madethem into smaller…

1. POWER UP 2-1 1.Explain the difference between an electron and a proton.Name the particle that has a neutral charge in an atom. 2. Mass Atoms Electrons and Nucleus Nucleus…

1. Today: Radioactivity Introduction Some of our goals for the next few lectures Learn about thephysicsof radioactivity and nuclear reactions. Learn about the hazards and…

1. STRUCTURE OF ATOM Made by :Dr. Isha jaiswal Moderator :Dr. S.P.MISHRA 2. •Changes in view of “aToM” 3. •Democritus (400 B.C.) • Proposed that matter was composed…

1. The atom 2. Atoms• Democritus 460BC – 370BC cuttingcopper wire in half, last bit atom• Atoms are thought of as the smallest partof an element• They are formed…

WELCOME STRUCTURE OF THE ATOM Atoms have three types of sub atomic particles. They are electrons, protons and neutrons. Electrons are negatively charged (e-), protons are…