Скачать или смотреть w b b s e class 9 physical science chapter 4 matter: Atomic structure, Part -3

this video contains Simple explanation of Neil growth theory atomic number isotopes


Bohr modified this atomic structure model by explaining that electrons move in fixed orbitals (shells) and not anywhere in between and he also explained that each orbit (shell) has a fixed energy level. Rutherford basically explained the nucleus of an atom and Bohr modified that model into electrons and their energy levels.

Bohr’s model consists of a small nucleus (positively charged) surrounded by negative electrons moving around the nucleus in orbits. Bohr found that an electron located away from the nucleus has more energy, and electrons close to the nucleus have less energy.


Atomic number-The total number of protons in the nucleus of an atom gives us the atomic number of that atom.

It is represented with the letter ‘Z.’

All the atoms of a particular element have the same number of protons, and hence the same atomic number.

Atoms of different elements have different atomic numbers.

For example, all carbon atoms have the atomic number of 6, whereas all atoms of Oxygen have 8 protons in their nucleus


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