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Chapter 4 Section 1

The Development of a New Atomic Model
by

danielle moore

on 16 October 2012

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Transcript of Chapter 4 Section 1

Chapter 4 Section 1 Arrangement of
Electrons in Atoms The Development
of a New Atomic Model Electromagnetic Radiation Electromagnetic radiation is a form of energy
that exhibits wavelike behavior as it travels
through space. Together, all the forms of electromagnetic radiation
form the electromagnetic spectrum. Wavelength Wavelength is the distance between
corresponding points on adjacent waves. Frequency (v) is defined
as the number of waves that pass a given point
in a specific time,
usually one second. The Photoelectric Effect The photoelectric effect refers to the emission of electrons from a metal when light shines on the metal. Line Emission Spectrum When a narrow beam of light is shined through a prism, it will separate into four specific colors known as the visible spectrum, this is known as a line-emission spectrum. Niels Bohr proposed the Bohr Model in 1913. The Bohr Model suggested that electrons are located
around the nucleus of an atom in layers, like rungs of a ladder.
Showing that electrons belonged to one specific layer,
or orbital, and never in between. Emission
When an electron falls to a lower energy level,
a photon is emitted, and the process is called emission. Absorption
Energy must be added to an atom in order to move an electron from a lower energy level to a higher energy level. This process is called absorption.
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