History of the atomic theory

Investigating pressure and properties of gases

Billiard Ball Model; It proposed that atoms were small, hard spheres and were the smallest particles of matter.

Thomson; Thomson's model helped us understand that atoms are made of smaller, subatomic particles.

<p>Spectral lines are evidence of electrons moving between energy levels, emitting and absorbing light, supporting the concept of electron orbits.</p> Signup and view all the answers

<p>Bohr's model modified the planetary model by introducing fixed energy levels for electrons, contrary to the continuous orbits in Rutherford's model.</p> Signup and view all the answers

<p>Chadwick proposed the existence of neutrons, explaining the stability of the nucleus and the concept of isotopes.</p> Signup and view all the answers

<p>Dalton</p> Signup and view all the answers

<p>1808</p> Signup and view all the answers

<p>Combinations of atoms of two or more elements in simple numerical ratios</p> Signup and view all the answers

<p>All atoms of a given element are identical in mass and properties</p> Signup and view all the answers