Chemistry > Structure of Atom > 2.0 Cathode Ray Discharge Tube
Structure of Atom
1.0 Introduction
2.0 Cathode Ray Discharge Tube
3.0 Thomson Model of Atom
4.0 Rutherford Model of Atom
5.0 Atomic Number and Mass Number and It's Relation
6.0 Planck's Quantum Theory
7.0 Bohr’s Atomic Model
8.0 Dual Behaviour of Matter
9.0 Heisenberg Uncertainity Principle
10.0 Photoelectric Effect
11.0 Atomic Spectra
12.0 Quantum Mechanical Model of Atom
13.0 Quantum Number
14.0 Electronic Configuration of Elements
14.1 Aufbau (or building up) Principle
14.2 Pauli’s Exclusion Principle
14.3 Hund’s Rule
14.4 Stability of Completely Filled and Half Filled Subshells
2.3 Proton and Neutron
14.2 Pauli’s Exclusion Principle
14.3 Hund’s Rule
14.4 Stability of Completely Filled and Half Filled Subshells
Electrical discharge carried out in the modified cathode ray tube led to the discovery of particles carrying positive charge, also known as canal rays.
- Unlike cathode rays, the positively charged particles depend upon the nature of gas present in the cathode ray tube.
- These are simply the positively charged gaseous ions.
- The charge to mass ratio of the particles is found to depend on the gas from which these originate.
- Some of the positively charged particles carry a multiple of the fundamental unit of electrical charge.
- The behaviour of these particles in the magnetic or electrical field is opposite to that observed for electron or cathode rays.
| Particle | Charge | Mass | Symbol |
| Electron | -($ - 1.6 \times {10^{ - 19}}$) | $9.11 \times {10^{ - 31}}kg$ | $e$ |
| Proton | +($ + 1.6 \times {10^{ - 19}}$) | $1.67262 \times {10^{ - 27}}kg$ | $p$ |
| Neutron | 0 | $1.67493 \times {10^{ - 27}}kg$ | $n$ |
