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Chemistry / Structure of Atoms

Have you ever thought how does an atom look like? What does it contain? John Dalton, Rutherford and JJ Thomson conducted experiments and gave the structure of an atom
J.J. Thomson proposed that electrons are embedded in a positive sphere.
Rutherford’s alpha-particle scattering experiment led to the discovery of the atomic nucleus. Rutherford’s model of the atom proposed that a very tiny nucleus is present inside the atom and electrons revolve around this nucleus. The stability of the atom could not be explained by this model.
J. Chadwick discovered presence of neutrons in the nucleus of an atom.
So, the three sub-atomic particles of an atom are: (i) electrons, (ii) protons and (iii) neutrons.
Learn other interesting topics like: distribution of electrons in an atom (electronic configuration), valency, atomic number, atomic mass, isotopes and isobars.

Types of motion

• Simple harmonic motion – (e.g., that of a pendulum).
• Linear motion – motion which follows a straight linear path, and whose displacement is exactly the same as its trajectory.
• Reciprocal motion (e.g. vibration)
• Random motion (e.g. vibration)
• Brownian motion (i.e. the random movement of particles)
• Circular motion (e.g. the orbits of planets)
• Rotary motion – a motion about a fixed point. (e.g. Ferris wheel).
• Curvilinear motion – It is defined as the motion along a curved path that may be planar or in three dimensions.
• Rotational motion
• Rolling motion - (as of the wheel of a bicycle)
• Oscillation - (swinging from side to side)
• vibratory motion
• Combination (or simultaneous) motions - Combination of two or more above listed motions
• Projectile motion - uniform horizontal motion + vertical accelerated motion
• Half projectile motion
• circular motion (this is a motion that move in a round of body, e.g. the moon and the earth)
• Linear motion