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Stack #804990
| Question | Answer |
|---|---|
| Nucleus | The small, dense positively charged center of the atom. |
| Subatomic Particle | Neutrons, Protons and Electrons |
| Proton | Subatomic particle that has a positive charge and is found in the nucleus of the atom |
| Atomic Mass Unit (amu) | Unit used to measure the masses of subatomic particles |
| Neutron | Particle with no electric charge that is found in the nucleus |
| Atomic Number | Number of protons in the nucleus of an atom |
| Isotope | Atom of an element that has the same number of protons as another atom of the same element but with a different number of neutrons |
| Mass Number | The sum of the # of protons and # of neutrons in the nucleus of an atom |
| Atomic Mass | The average of the masses of all the existing isotopes of an element |
| Electron | The negatively charged particle of an atom found in an area outside the nucleus of an atom |
| Electron Cloud | The space in which electrons are likely to be found |
| Energy Level | Location of electrons in an atom - shell where electrons are orbiting |
| Quark | Particles that makes up neutrons and protons in the nucleus of an atom |
| Electromagnetic Force | Force of attraction or repulsion between particles in an atom |
| Strong Force | Force that binds protons and neutrons in the nucleus |
| Weak Force | Force that is key to the power of the sun; responsible for a process known as radioactive decay |
| Gravity | Force of attraction between all objects in the universe |
| Democritus | Greek philosopher; his theory was that matter could not be divided into smaller and smaller pieces forever; called the smallest piece "atomos" meaning indivisible. |
| John Dalton | His theory was that all elements are composed of atoms that are indivisible and indestructible;atoms of the same element are exactly alike;atoms of different elements are different & compounds are formed by the joining of atoms of 2 or more elements |
| J.J.Thomson | Discovered the electron proving that the atom is divisible; model called "Plum Pudding" showed poitively charged "pudding" throughout which negatively charged electrons were scattered. |
| Ernest Rutherford | His gold foil experiment led him to the theory of the atomic model that shows that an atom has a small, dense positively charged nucleus surrounded by negatively charged electrons. |
| Niels Bohr | His model of the atom pictured electrons moving in definite orbits or energy levels around the nucleus |
| Wave Model | Electrons do not move about an atom in definite orbits. The exact location of an electron is impossible to determine. |
Created by:
sjmark
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