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September 21

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Jaclyn Smith

on 21 September 2016

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Transcript of September 21

September 21
Bellwork Question:

List the steps of the scientific method in order

Early Models of the Atom
John Dalton (1766-1844)

Using experimental methods, Dalton transformed the ideas of Democritus into a scientific theory.

1.) All elements are composed of tiny indivisible particles called atoms.
2.) Atoms of the same element are identical. The atoms of any one element are different from those of any other element.

Modern Atomic Theory
The essence of Dalton’s theory remains valid
Today we know that atoms can be destroyed via nuclear reactions but not by chemical reactions
There are also different kinds of atoms within an element known as isotopes

What is an atom?
The smallest particle of matter that still has all of the properties and characteristics of that type of matter.

A silver atom is the smallest particle of silver that still has all properties of silver.
Early Models of the Atom
The Greek philosopher Democritus (460 B.C. – 370 B.C.) was among the first to suggest the existence of atoms.

He believed that atoms were indivisible and indestructible.

Has 3 kinds of particles:
Protons (positive charge),
neutrons (neutral),
electrons (negative charge)
Protons and neutrons are located in
the atomic nucleus (center of atom)
Electrons are located around the
nucleus in an electron cloud and
occupies almost all of the volume
of the atom.

Atoms are very small
3.) Atoms of different elements can physically mix together or can chemically combine in simple whole-number ratios to form compounds.
4.) Chemical reactions occur when atoms are separated, joined or rearranged. Atoms of one element, however, are never changed into atoms of another element as a result of a chemical reaction.

Dalton's Atomic Theory
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