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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Early in the 1800s John Dalton proposed that an atom was a "solid, massy, hard, impenetrable, moveable particle." Critique this description. How does this description misrepresent atomic structure?

Interpretation Introduction

Interpretation:

The solid, massy, hard, impenetrable and movable particle description of John Dalton proposal has to be critically analyzed.

Concept introduction:

  • According to J.J Thomson (1897), the atomic sub particles such as nucleus is positively charged and negatively charged electrons are embedded into it.
  • According to Robert Millikan (1908), the charge of the electrons is measured through experiment as 1.592×1019C.
  • According to Rutherford’s experiment, an atom has mostly empty space with tiny nucleus at its center; the electrons are surrounding the nucleus and account for the most of the volume of the atom.
  • According to James Chadwick (1932), nucleus contains neutral charged substance and it has mass of 1.675×1024g.
Explanation

In the early 1800s, John Dalton proposed the atomic model a solid, massy, hard, impenetrable and movable particle. These descriptions of the atom are far different from the today’s descriptions of an atom.

According to J.J Thomson (1897), the atomic sub particles such as nucleus is positively charged and negatively charged electrons are embedded into it. Hence, J.J Thomson (1897) has found the presence of some sub atomic particles such as nucleus and electrons.

According to Robert Millikan (1908), the charge of the electrons is measured through experiment as 1.592×1019C. Hence, Robert Millikan has discovered the charge of electrons close to today’s value of charge of electrons 1

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