Chemistry
State the main points of contradiction of Dalton’s atomic theory by the Modern Atomic Theory.
Answer
Contradiction of Dalton’s atomic theory by the Modern Atomic Theory:
| Dalton's atomic theory | Modern atomic theory |
|---|---|
| Atoms are indestructible | Atoms are destructible |
| Atoms are indivisible & smallest particle of an element. | Atoms are divisible & consist of - protons, electrons & neutrons |
| Atoms of the same element are alike in all respect. | Atoms of the same element may not be alike as per the modern theory. |
Related Questions
Draw the basic structure of an atom representing its –
(a) Subatomic particles
(b) Nucleus
(c) Orbits or shells.
In the Modern Periodic Table – atoms of all elements are arranged according to the their increasing order of – atomic numbers. An atom of nitrogen has seven protons and seven electrons. State what would be its atomic number.
Atoms of the same element or different elements combine to form a molecule. Give two examples each of –
(a) atoms of the same element
(b) atoms of different elements combining to form a molecule.
Explain the term – 'atomicity'. Give a reason why –
(a) Helium is considered monoatomic, but hydrogen a diatomic molecule.
(b) Ozone is considered triatomic, but phosphorus a tetratomic molecule.