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Atomic theory
Atomic theory names
| Question | Answer |
|---|---|
| who stated that all of matter was made up of four things: air, earth, fire, and water | Aristotle |
| who was the first to state that matter is composed of atoms and is mostly empty space | Democritus |
| who was the first to perform experiments to support the hypothesis that all matter is made of atoms | Dalton |
| whose work lead to the modern atomic theory | Dalton |
| whose work supported that matter/mass is not created nor destroyed nor divided just separated, combined, and rearranged | Dalton |
| whose work supported the Law of Conservation of Matter/Mass | Dalton |
| who discovered cathode rays being emitted from cathode ray tubes | William Crookes |
| whose discovery led to the invention of the television | William Crookes |
| whose discovery led to the discovery of electrons (he did not discover them – his work led to someone else discovering them) | William Crookes |
| who used cathode ray tubes to find the charge-to-mass ratio of the cathode ray tube charged particle | JJ Thomson |
| who discovered the first subatomic particle – the electron | JJ Thomson |
| who proposed the plum pudding model of an atom | JJ Thomson |
| who discovered the amount of charge on an electron | Millikan |
| who performed the oil drop experiment | Millikan |
| who discovered the mass of an electron | Millikan |
| who performed the gold foil experiment | Rutherford |
| who discovered that atoms have a positive nucleus | Rutherford |
| who discovered the proton | Rutherford |
| who discovered the neutron | Chadwick |
| which experiment included A beam of alpha particles leave a lead block aimed at a thin sheet of metal, | gold foil experiment |
| which experiment included An atomizer releases drops of oil into a container with charged plates, | oil drop experiment |
| which experiment included A vacuum tube (glass tube without air) releases a stream of charged particles from the positive anode end to the negative cathode end | cathode ray tube experiment |
| who said Matter does not have any empty space | Aristotl |
| who said Atoms are indivisible, are made up of empty space | Democritus |
| Atoms are a field of evenly distributed positive charge with negative electrons were distributed throughout | plum pudding |
| who said Atoms have a nucleus of positive protons with negative electrons in the space around it | Rutherford |
| Atoms have a nucleus of positive protons, neutral neutrons, and negative electrons in the space around it | Modern nuclear atom |
| Unstable nuclei tend to break down or | decay releasing radiation |
| Isotopes with unstable nuclei are said to be | radioactive |
| The time that it takes for half of a radioactive sample to decay is called the | half life |
| Shorter half-lives indicate which type of nucleus: more stable or more unstable? | more unstable |
| What are the two main forces at work inside the atomic nucleus? | strong nuclear force and electromagnetic |
| Which one pushes protons apart strong nuclear force or electromagnetic | electromagnetic |
| Which ratio is important in determining the stability of an isotope: the proton-electron or proton-neutron? | p-n |
| Which proton-neutron ratio do most stable nuclei have? | 1:1 |
| A plot of the number of neutrons versus the number of protons for stable nuclei reveals that the stable isotopes fall into a narrow band called the band of | stability |
| Typically, elements with atomic numbers less than 20 are referred to as: light or heavy elements? | light |
| What is one of the most stable isotopes? | lead-206 |
| 72. Elements with atomic numbers between 20 and 81 are referred to as: light or heavy elements? | heavy |
| Would you predict U-238 to be stable or unstable? | Unstable (heavy element); big difference between p and n |
| Unstable atomic isotopes that break down to release radiation are called | radioactive |
| Which radiation particle is a helium nucleus consisting or 2 protons and 2 neutrons? | Alpha symbol a |
| What device is used to study unknown substances by breaking them down into smaller fragments and separating the fragments by their masses? | mass spectrometer |
| What letter symbol is used to represent the atomic number? | Z |
| What letter symbol is used to represent the mass number? | A |
Created by:
Rachel-reams
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