JOHN DALTON

YOUNG JOHN DALTON

• Born in Cumberland, England in 1766
• Opened a boarding school at 15 and became principal at 19
• Started teaching at University in Manchester in 1793
• Wrote famous color blindness paper in 1794

IMPORTANT DATES

ATOMIC THEORY

• Elements are made of extremely small particles called atoms
• Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in these aspects
• Atoms cannot be divided, created, or destroyed.
• Atoms of different elements combine in simple ratios to form compounds
• In chemical reactions, atoms are combined, separated, or rearranged

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EXPERIMENTS

• Gas: measured how much water vapor air could absorb at different temperatures. This helped develop his Law of Partial Pressures.
• Combined different gases and concluded the Law of Multiple Proportions- the weights of elements always combine in whole number ratios.

LATER YEARS

• In 1817, he received the title of president of Manchester Literary and Philosophical Society
• In 1832, he received a Doctorate of Science from Oxford
• In 1834, he received a Doctorate of Laws from Edinburgh
• In 1844, he had his second stroke and died