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Chapter 2 Atoms and the Periodic Table

Chapter 2 Atoms and the Periodic Table - Charge of...

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Chapter 2 Atoms and the Periodic Table Radiation : the emission and transmission of energy in the form of waves Cathode ray tube : two metal plates sealed inside a glass tube from which most of the air has been evacuated Cathode : negatively charged plate. Emits radiation (cathode rays) Anode : positively charged plate. Cathode ray moved toward it Revealed that no matter what material cathode ray tube was made of the results were always the same = cathode rays are more fundamental than atoms themselves and are common to all matter Coulomb's Law : like charges repel one another and opposite charges attract one another "Ray's" are streams of negatively charged particles (electrons) Electron charge to mass ratio: 1.76 X 10^8 C/g (coulombs/gram)
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Unformatted text preview: Charge of electron: -1.6022 X 10 ^-19 C Mass of electron: 9.1- X 10^-28 g Alpha Rays (α): consist of positively charged particles Beta Rays (β): are electrons and are negatively charged particles Gamma Rays (γ): no charge and are unaffected by external electric or magnetic fields Nucleus : extremely dense core within the atom Protons: carry the same magnitude of charge as electrons but are positive But much larger mass of 1.67262 X 10 ^-24 g Neutrons: no charge. Mass slightly greater than that of protons Isotopes: atoms that have the same atomic number but different mass numbers (different number of neutrons)...
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