-
John Dalton discovered that common substances brake down into the same elements of the same proportion. This discovery means that all similar objects/substances are made of the same type of 'stuff' of the same size. This was important because it was the first representation of a atom.
-
Dmitri Mendeleev most important discovery was actually a creation. He was the creator of the current periodic table. the periodic table is a list of all the elements and their atomic structure. This discovery was important because even today the periodic table is almost unchanged and provides us useful information about elements.
-
J.J. Thomson discovered the electron., A electron is a negatively charged particle in a atom. This discovery was important because it added onto John Dalton's model of the atom.
-
Marie Curie discovered the two elements, Radium and Polonium. These are two radioactive elements. This discovery is important because it opened a new field of science, radioactivity.
-
Rutherford discovered that atoms consisted largely of air. Atoms where not a solid ball like Dalton said but where made partially of air. This discovery was important because it completely changed the model of the atom and was no longer a solid ball.
-
Bohr discovered that electrons rotated around a nucleus at a fixed location. This is similar to how planets rotate around the sun. This discovery was important because it added on to Rutherford's model and made it more accurate.
-
Plan projects on a visual timeline
Map milestones, phases, deadlines, and key events in one place so the sequence is easier to see and share. Timetoast is a timeline maker for work, school, research, and stories.