atomic theory quiz Flashcards
Who believed that atoms are made of the same material but have different shapes and sizes, which determined the physical properties of the material, and the different arrangements of these atoms produced different substances
the Greeks
who was a Greek philosopher that believed that matter can be divided until it can’t be divided anymore and called the particle that could no longer be divided an atom
Democritus
Who’s atomic theory states that matter is made up of extremely small particles called atoms, all atoms of the same element are identical, atoms of one element are different from atoms of another element, atoms cannot be created, destroyed, or divided into smaller particles, atoms can combine in whole number ratios to form compounds, and in a chemical reaction, atoms are separated, combined, or rearranged?
John Dalton’s
compared to Dalton’s atomic theory, what are two things we know today?
- atoms of the same element can differ in mass (isotopes)
- atoms are composed of smaller subatomic particles
who used a cathode ray tube to conduct experiments to create a stream of electrons, and believed that atoms are divisible into subatomic particles and first person to identify the electron, and said that atoms where neutral
JJ Thomas
who discovered the nucleus and developed the gold foil experiment which states that a radioactive sample emits a beam of alpha particles into a lead block shield, which then comes in contact with the gold foil which then emits the alpha particle beams to a zinc sulfide screen in which the particles hit and some alpha particles are deflected and concluded there was a tiny dense nucleus in the center which is positively charged and contains all the mass of the atom?
Ernest Rutherford
who developed the plum pudding model, where there is positively charged pudding and negatively charged plums (electrons)
JJ Thomas
who determined that electrons orbit around a nucleus in a definite orbit, proposed that electrons move in specific energy levels, and developed the electron cloud model, where there is a region where electrons are likely to be found, and there is a nucleus in the middle of the area, and developed a sort of planetary model to describe his findings?
Niels Bohr
