JOHN DALTON'S ATOMİC THEORY

JOHN DALTON

English, 1766-1844 Chemist,

meteorologist and physicist

Careful study of Red – green color blindness

Atomic theory, gas law, atomic weight

DALTON’S THEORY

All matter is composed of indivisible particles called atoms.

Atoms are indivisible and indestructible.

Atoms of the same element are identical to one another in mass and

other properties.

Atoms combine in simple whole number ratios to form compounds.

Atoms of an element are not changed into atoms of a different element by

chemical reactions.

Dalton was even the first to make

an attempt at creating a table

of atomic weights

DA

LTO

N’S

FO

RM

ULA

S

Chemical

reactions

involve the rearrangement of atoms.

SHORTCOMINGS OF DALTON’S ATOMIC

MODEL

the discovery of nuclear fission and fusion

Isotopes Atoms are not empty, there are empty

spaces in atoms.

WHY DID PEOPLE BELIEVE DALTON?

He had EVIDENCE! Dalton found that compounds always

contained the same mass ratio of one element to another

This is now known as the “Law of Definite Proportions” Elements could combine in different ratios, but when they did, they would

make different compounds. This is now known as the “Law of

Multiple Proportions”

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