Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Atomic models
Document related concepts
Transcript
Atomic models Change the order of the items in the last four columns to match the dates of the first column. Date Person Model Description 350 BC Thomson Solar system model Atoms consisting of a positive nucleus with electrons in certain orbits of fixed energy called ‘shells’. 1803 AD Rutherford Indivisible particles— atoms Positively charged spheres with electrons embedded in them. 1897 AD Chadwick Shell model Matter made up of tiny indivisible particles. This model was based on observations of pure substances. 1909 AD Democritus Plumpudding model The atom as mostly empty space with a positively charged nucleus and electrons orbiting the nucleus. 1913 AD Bohr Neutrons in the nucleus All matter made up of tiny building blocks, given the Greek word atomos meaning unable to be divided. 1932 AD Dalton Indivisible particles— atomos The discovery of neutrons explained why an atom was heavier than expected if it contained only protons and electrons. Diagram Copyright © Pearson Australia (a division of Pearson Australia Group Pty Ltd) – Science Worksheet Searcher 1
