the first complete attempt to describe all matter in terms of atoms and their properties.
Illustration:
Dalton's analogical illustration of the mechanism of absorption of two gases by water (1805) using the pile of shot analogy, in which the gas atoms of one kind are arranged in a series of horizontal strata, and 'the pressure is steady and uniform throughout' until another kind of gas atom is present.
Thomson model
description:
the atom is composed of electrons surrounded by a soup of positive charge to balance the electrons' negative charges, like negatively charged “plums” surrounded by positively charged “pudding”.
Illustration:
the atomic structure of matter
Rutherford model:
description:
an atom is mostly empty space, with electrons orbiting a fixed, positively charged nucleus in set, predictable paths.
Illustration:
central core
Bohr model:
description:
a system consisting of a small, dense nucleus surrounded by orbiting electrons—similar to the structure of the Solar System, but with attraction provided by electrostatic forces in place of gravity.
Illustration:
The Bohr model postulates that electrons orbit the nucleus at fixed energy levels.
Answers & Comments
Dalton model
description:
the first complete attempt to describe all matter in terms of atoms and their properties.
Illustration:
Dalton's analogical illustration of the mechanism of absorption of two gases by water (1805) using the pile of shot analogy, in which the gas atoms of one kind are arranged in a series of horizontal strata, and 'the pressure is steady and uniform throughout' until another kind of gas atom is present.
Thomson model
description:
the atom is composed of electrons surrounded by a soup of positive charge to balance the electrons' negative charges, like negatively charged “plums” surrounded by positively charged “pudding”.
Illustration:
the atomic structure of matter
Rutherford model:
description:
an atom is mostly empty space, with electrons orbiting a fixed, positively charged nucleus in set, predictable paths.
Illustration:
central core
Bohr model:
description:
a system consisting of a small, dense nucleus surrounded by orbiting electrons—similar to the structure of the Solar System, but with attraction provided by electrostatic forces in place of gravity.
Illustration:
The Bohr model postulates that electrons orbit the nucleus at fixed energy levels.
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