Unlocking the Secrets of Electron Charge

John Dalton

atomos

To understand what matter is and how it behaves

<p>J. J. Thomson</p> Signup and view all the answers

<p>Quantum model or electron cloud model</p> Signup and view all the answers

<p>Matter is made up of tiny particles called atoms that cannot be divided into smaller pieces and cannot be destroyed</p> Signup and view all the answers

<p>Democritus, John Dalton, J. J. Thomson, Ernest Rutherford, Niels Bohr, Robert Millikan, Irwin Schrodinger</p> Signup and view all the answers

<p>Atoms are the smallest pieces of matter and contain no smaller parts. All atoms in an element have identical atoms, different elements have different atoms, and atoms of different elements can combine to make compounds.</p> Signup and view all the answers

<p>Solid spheres or semi-solid spheres with smaller particles evenly distributed throughout; dense nucleus with electrons orbiting the nucleus</p> Signup and view all the answers

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

<p>The atom consists mostly of empty space and that all the positive charge is not evenly spread throughout the atom but instead squished into a teeny tiny nucleus in the center of the atom.</p> Signup and view all the answers

<p>He used his 'oil drop experiment,' where he sprayed charged oil drops between two metal plates and balanced out the downward gravitational force with electrical force equal to the charge on the oil drop, which caused the oil drop to repel upward.</p> Signup and view all the answers

<p>J. J. Thomson</p> Signup and view all the answers

<p>the 'plum pudding' model</p> Signup and view all the answers

<p>the atom consists mostly of empty space and has a small, dense, positively charged nucleus</p> Signup and view all the answers

<p>using his 'oil drop experiment'</p> Signup and view all the answers

<p>that matter is made up of tiny particles called atoms that cannot be divided into smaller pieces and cannot be destroyed</p> Signup and view all the answers

<p>Dalton's findings supported the theory that gasses are matter made of tiny, round particles (atoms), and that different gasses were made of different types of atoms. His experiments showed that atoms do exist and that all atoms in pure elements are identical to each other.</p> Signup and view all the answers

<p>Thomson's findings showed that Dalton's model of the atom as a solid sphere without smaller parts was incorrect. Thomson discovered the existence of electrons, which are tiny, negatively-charged particles within atoms.</p> Signup and view all the answers

<p>Rutherford's experiments showed that atoms have a dense concentration of particles in the center (nucleus), with smaller, less dense particles (electrons) surrounding it. The experiments also revealed that there is seemingly empty space between the nucleus and the surrounding electrons.</p> Signup and view all the answers