The Greek philosophers, Leucipus and Democritus, suggested that everything, including us, was made...

The Greek philosophers, Leucipus and Democritus, suggested that everything, including us, was made of tiny indivisible particles - called atoms

a = not

tomos = cut

but it was John Dalton, who lived in Manchester, who proved it more than 2000 years later

Dalton’s drawings of atoms

Paper read to the Manchester Literary and Philosophical Society, 20th October

1803

1/3 nm

CO2

C + O2 → CO2

The arrow is at least as important as it describes the

chemical reaction

Paper read to the Manchester Literary and Philosophical Society, 20th October

1803

H

N

C

O

Five main points of Dalton's atomic theory1. The atoms of a given element are different from those of any

other element; the atoms of different elements can be distinguished from one another by their respective relative atomic weights.

http://en.wikipedia.org/wiki/John_Dalton

Five main points of Dalton's atomic theory1. The atoms of a given element are different from those of any

other element; the atoms of different elements can be distinguished from one another by their respective relative atomic weights.

2. All atoms of a given element are identical.

http://en.wikipedia.org/wiki/John_Dalton

Five main points of Dalton's atomic theory1. The atoms of a given element are different from those of any

other element; the atoms of different elements can be distinguished from one another by their respective relative atomic weights.

2. All atoms of a given element are identical. 3. Atoms of one element can combine with atoms of other

elements to form chemical compounds; a given compound always has the same relative numbers of types of atoms.

http://en.wikipedia.org/wiki/John_Dalton

Five main points of Dalton's atomic theory1. The atoms of a given element are different from those of any

other element; the atoms of different elements can be distinguished from one another by their respective relative atomic weights.

2. All atoms of a given element are identical. 3. Atoms of one element can combine with atoms of other

elements to form chemical compounds; a given compound always has the same relative numbers of types of atoms.

4. Atoms cannot be created, divided into smaller particles, nor destroyed in the chemical process; a chemical reaction simply changes the way atoms are grouped together.

http://en.wikipedia.org/wiki/John_Dalton

Five main points of Dalton's atomic theory1. The atoms of a given element are different from those of any

other element; the atoms of different elements can be distinguished from one another by their respective relative atomic weights.

2. All atoms of a given element are identical. 3. Atoms of one element can combine with atoms of other

elements to form chemical compounds; a given compound always has the same relative numbers of types of atoms.

4. Atoms cannot be created, divided into smaller particles, nor destroyed in the chemical process; a chemical reaction simply changes the way atoms are grouped together.

5. Elements are made of tiny particles called atoms.

http://en.wikipedia.org/wiki/John_Dalton

Five main points of Dalton's atomic theory1. The atoms of a given element are different from those of any

other element; the atoms of different elements can be distinguished from one another by their respective relative atomic weights.

2. All atoms of a given element are identical. 3. Atoms of one element can combine with atoms of other

elements to form chemical compounds; a given compound always has the same relative numbers of types of atoms.

4. Atoms cannot be created, divided into smaller particles, nor destroyed in the chemical process; a chemical reaction simply changes the way atoms are grouped together.

5. Elements are made of tiny particles called atoms.

Dalton proposed an additional "rule of greatest simplicity" that created controversy, since it could not be independently confirmed.

http://en.wikipedia.org/wiki/John_Dalton

Five main points of Dalton's atomic theory1. The atoms of a given element are different from those of any

other element; the atoms of different elements can be distinguished from one another by their respective relative atomic weights.

2. All atoms of a given element are identical. 3. Atoms of one element can combine with atoms of other

elements to form chemical compounds; a given compound always has the same relative numbers of types of atoms.

4. Atoms cannot be created, divided into smaller particles, nor destroyed in the chemical process; a chemical reaction simply changes the way atoms are grouped together.

5. Elements are made of tiny particles called atoms.

Dalton proposed an additional "rule of greatest simplicity" that created controversy, since it could not be independently confirmed. When atoms combine in only one ratio, "..it must be presumed to be a binary one, unless some cause appear to the contrary".

http://en.wikipedia.org/wiki/John_Dalton

H

N

C

O

HO

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HO HN

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HO HN NO

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HO HN NO HC

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HO HN NO HC OC

H

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HO HN NO HC OC

NON

H

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HO HN NO HC OC

NON ONO

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HO HN NO HC OC

OCONON ONO

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HO HN NO HC OC

OCO HCHNON ONO

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HO HN NO HC OC

OCO HCHNON ONO

NO3

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O

Dalton was the first NanotechnologistSo

Five main points of Dalton's atomic theory

http://en.wikipedia.org/wiki/John_Dalton

CO2

John Dalton

John Dalton

Paper read to the Manchester Literary and Philosophical Society, 20th October

1803

NN&Nanoscience

Nanotechnologyis 200 years old

CO2