Chemistry is Magic

Chemistry Order Trends 📄📃

Reactivity series Notes with easy trick
I'm sharing my reactivity series notes, and they come with an easy trick to help you remember!

Types of Organic Reactions.

Chemistry question answer please objective type 📃

Evolution of Atomic Models ⚛️

1. John Dalton — Solid Sphere Model (1803)
“Atoms are tiny, indivisible solid particles that combine in fixed ratios to form matter.”
Explanation:
➡️Dalton proposed the first scientific atomic theory.
➡️According to him, atoms were like hard solid balls.
➡️Atoms of the same element are identical, while different elements have different atoms.
➡️Chemical reactions involve rearrangement of atoms, not creation or destruction.

2. J. J. Thomson — Plum Pudding Model (1904)
“Negative electrons are embedded inside a positively charged sphere.”
Explanation:
➡️Thomson discovered the electron using cathode ray experiments.
➡️He suggested that atoms are made of a positive sphere with electrons scattered inside it.
➡️This model is called the Plum Pudding Model because electrons resembled raisins inside pudding.

3. Ernest Rutherford — Nuclear Model (1911)
“Atoms contain a tiny, dense, positively charged nucleus with electrons revolving around it.”
Explanation:
➡️Rutherford performed the famous Gold Foil Experiment.
➡️He discovered that most of the atom is empty space.
➡️The positive charge and most mass are concentrated in the nucleus.
➡️Electrons revolve around the nucleus like planets around the Sun.

4. Niels Bohr — Bohr’s Planetary Model (1913)
“Electrons move in fixed energy levels or shells around the nucleus.”
Explanation:
➡️Bohr improved Rutherford’s model.
➡️He proposed that electrons revolve in specific circular orbits called energy levels.
➡️Electrons can jump between levels by absorbing or releasing energy.
➡️This model explained the spectrum of hydrogen atom.

5. Erwin Schrödinger — Quantum Mechanical Model (1926)
“Electrons exist in probability clouds rather than fixed paths.”
Explanation:
➡️Schrödinger developed the wave equation for electrons.
➡️Electrons do not move in fixed orbits.
➡️Their exact position cannot be determined; instead, we predict the probability of finding them.
➡️This modern model is called the Electron Cloud Model or Quantum Mechanical Model.

“From solid spheres to quantum clouds, the atomic model evolved through discoveries that revealed the true structure of matter.”




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Important Chemistry formula .

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