Atoms, Molecules and Ions
1. Basic postulates of Dalton’s atomic theory.
2. The structure of the atom and isotopes
3. Periodic table.
4. Chemical formulas of ionic compounds.
, Atomic Theory of Matter
Democritus (Greek philosopher) believed that there was a smallest
particle “atomos” (uncuttable, indivisible) that made up all of nature.
Experiments in the eighteenth and nineteenth centuries led to an
organized atomic theory by John Dalton in the early 1800s, which
explained several laws known at that time:
1. The law of constant composition.
2. The law of conservation of mass.
3. The law of multiple proportions.
, 1. Law of Constant Composition Joseph Proust
(1754–1826)
Also known as the law of definite proportions.
”The elemental composition of a pure substance
never varies.“
or
”In a given compound, the relative numbers and
kinds of atoms are constant.“
Basis of Dalton’s Postulate # 4
1. Basic postulates of Dalton’s atomic theory.
2. The structure of the atom and isotopes
3. Periodic table.
4. Chemical formulas of ionic compounds.
, Atomic Theory of Matter
Democritus (Greek philosopher) believed that there was a smallest
particle “atomos” (uncuttable, indivisible) that made up all of nature.
Experiments in the eighteenth and nineteenth centuries led to an
organized atomic theory by John Dalton in the early 1800s, which
explained several laws known at that time:
1. The law of constant composition.
2. The law of conservation of mass.
3. The law of multiple proportions.
, 1. Law of Constant Composition Joseph Proust
(1754–1826)
Also known as the law of definite proportions.
”The elemental composition of a pure substance
never varies.“
or
”In a given compound, the relative numbers and
kinds of atoms are constant.“
Basis of Dalton’s Postulate # 4
