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Aspire Science Academy | Class 10 | Class 11 MHT-CET Admission Open
Structure of Atom
Atom consists of nucleus (protons + neutrons) and electrons revolving around it.
Most mass concentrated in nucleus.
Rutherford’s α-Scattering Experiment
Atom mostly empty space.
Small, dense, positively charged nucleus at center.
Electrons revolve around nucleus.
Bohr’s Atomic Model
Electrons move in fixed circular orbits without losing energy.
Only certain orbits allowed.
Energy emitted/absorbed when electron jumps between orbits.
Hydrogen Spectrum
Produced due to electron transitions.
Spectral series:
Lyman (UV)
Balmer (Visible)
Paschen, Brackett, Pfund (IR)
Nuclear Composition
Nucleus contains protons & neutrons (nucleons).
Atomic number (Z) = number of protons.
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