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Atom Scientist
Scientist who contributed to the modern atomic theory.
| Question | Answer |
|---|---|
| Said atoms are uncuttable. | Democritus |
| Said atoms are small, hard particles. | Democritus |
| Atoms are made of single material formed into different shapes and sizes. | Democritus |
| Atoms of different elements are different. | Dalton |
| Atoms of the same element are exactly alike. | Dalton |
| All substances are made of atoms. | Dalton |
| He wanted to know why elements combine is specific proportions. | Dalton |
| He conducted experiments in combining elements. | Dalton |
| His theory of the atmoic structure led to the "plum-pudding" model. | Thomson |
| There are small negatively charged particles inside the atom. | Thomson |
| He conducted the cathode-ray tube experiment. | Thomson |
| Most of an atom's mass is in the nucleus. | Rutherford |
| He conducted the gold foil experiment. | Rutherford |
| There is a small, dense, positively charged nucleus. | Rutherford |
| His model had electrons surrounding the nucleus at a distance. | Rutherford |
| Atoms contain mostly empty space. | Rutherford |
| Electrons travel in certain paths, or energy levels. | Bohr |
| Electrons can jump from a path in one level to a path in another. | Bohr |
| Electrons are found in electron clouds, not paths. | Schrodinger and Heisenberg |
| Electrons paths cannot be predicted. | Schrodinger |
| In physical science, an atom's central region, which is made up of protons and neturons. | Nucleus |
| Describes something that occurs or repeats at regular intervals. | Periodic |
| The sum of the numbers of protons and neutrons in the nucleus of an atom. | Mass number |
| A vertical column of elements in the periodic table; elements in a group share chemical properties. | Group |
| One of the elements of Group 2 of the periodic table(beryllium, magnesium, calcium, strantium, barium, and radium). | Alkaline-Earth Metal |
| ONe of the elements of Group of the periodic table(helium, neon, argon, krypton, xenon, and radon);are unreactive. | Noble Gas |
| ONe of the elements of Group 1, of the periodic table(lithium, sodium, potassium, rubudium, cesibium, and fancium) | Alkali Metal |
| An atom that has the same number of proton(or the same atom number) as other atoms of the some element do but that has a drift aren;tnumber of neutrons(and thus a different atomic mass). | Isotope |
| One of the elements of Group 17 of the periodic table (fluorine, chlorine, bromine, iodine, and astatine) they combine with most metals to form salts. | Halogen |
| In chemistry, a horizontal row of elements in the periodic table. | Period |
| The number of protons in the nucleus of an atom; the atomic # is the same for all atoms of an elements. | Atomic Number |
| A region around the nucleus of an atom where electrons are likely to be found. | Electron Cloud |
| A unit of massthat describes the mass of an atom or molecule. | Atomic Mass Unit |
| The smallest particle into hich an element can be divided and still be the same substance. | Atom |
| A subatomic particle has no change and that is found in the nucleus of an atom. | Neutron |
| A subatomic particle that has a positive charge and that is found in the nucleus of an atom. | Proton |
| THe mass of an atom expressed n atomic units. | Atomic Mass |
| THe law that states that the repeating chemical and physical proporties of elements change periodically with the atomic numbers of the elements. | Periodic |
| A subatomic particle that has a negative charge. | Electron |
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200229965