Structure of Atom

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Information about Structure of Atom
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Published on May 11, 2009

Author: ankush85

Source: authorstream.com

Slide 1: Structure of the Atom How are atoms studied? : How are atoms studied? Atoms are the building blocks of matter Atoms are too small in size to study easily Size of Earth : soda can = soda can : atom Who studied the atom? : Who studied the atom? Studied by many scientists for centuries Democritus (400 BC) – phrase “atomos” Rutherford (1911) – nucleus (gold foil expt) Moseley (1913) – X-rays to find atomic # *Bohr (1913) – planetary model of the atom *Schrödinger (1923) – electron cloud model Slide 4: The Bohr Model Slide 5: e I’m an electron! I’m a proton! I’m a neutron! P N Slide 6: e I was walking along and I saw these two. I was telling jokes to the neutron. The proton and I were having fun. Slide 7: e They looked so happy there together. I was p o s i t i v e l y charged! I couldn’t have amassed more happiness. P N P N P N P N e e e Slide 8: e The proton looked happy, so I wandered closer. I could see the electron coming near. The who? Huh? e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e Slide 9: They were HUGE next to me! The electron was so cute! Like a speck of dust, or something… e Slide 10: I didn’t want to seem obvious, so I kept walking. Around and around the electron goes. Hey electron, you’re making the proton dizzy. e e e e e e e e e e e e e e e e e e e e e e e e Slide 11: The proton seems so happy with the neutron. I’m having fun, but I still notice the electron. It won’t bother me if the electron hangs around. e Slide 12: I guess I’ll just wander around out here. I’m happy hanging out here. The center is cool, but sometimes it can be a “Bohr”. e e e e e e e e e e e e e e e e e e e e Slide 13: Electrons circle around the nucleus of an atom. Protons are a main part of the nucleus of an atom. Neutrons also hang out in the nucleus of an atom. e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e Slide 14: Electrons have a negative charge. ? Protons have a positive charge. + Neutrons have no charge. 0 e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e Slide 15: Electrons are little and have a mass of almost zero. Protons are big and have a mass of one. Neutrons are also big and have a mass of one. e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e Slide 16: e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e The Bohr Model What is the structure of an atom? : What is the structure of an atom? Nucleus – center of the atom Home of Protons and Neutrons Proton Has a positive (+) charge Has a relative mass of 1 Determines the atomic number Found inside the nucleus P What is the structure of an atom? : What is the structure of an atom? Neutron Has no (0) charge Has a relative mass of 1 Determines the isotope Isotopes are two of the same element with different masses Found inside the nucleus N What is the structure of an atom? : What is the structure of an atom? Electron Has a negative (-) charge Has a relative mass of 0 (zero) Determines the ion Found outside the nucleus Bohr model – electrons are in specific energy levels Electron cloud model – electrons are in a random cloud e What is the structure of an atom? : What is the structure of an atom? Bohr Model “Planetary Model” Schrödinger Model “Electron Cloud Model” How are P, N, e- related? : How are P, N, e- related? # protons = atomic number # electrons = # protons in a neutral atom # protons + # neutrons = atomic mass Slide 23: What is a chemical symbol? Chemical symbol tells us what atom it is Always a CAPITAL LETTER, sometimes followed by a lower case letter Ex: Oxygen O Nitrogen N Sodium Na *Cobalt – Co *Carbon Monoxide – CO (Co is an element, CO is a compound)

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