Question | Answer |
What is a proton? | a positively charged particle. |
Who was democritus? | He believed an atom was a single hard particle. |
WHo was aristotle? | He thought all things were compsed of: air; earth; water; and fire. |
What is an atom? | The smallest unit of an element that maintais the properties of the element. |
Who is John Dalton? | All substances are made of atoms. |
Who was Joseph Thomson? | He proved the existance of negatively charged particles inside the atom. |
Who was Ernest Rutherford? | Proved atoms are mostly space and the nucleus is very dense and has a postive electical charge. |
Who was Bohr? | He proposed that electrons moved around an atom in a certain path or energy level. |
Who were SHrodinger and Heisenberg? | The exact path of an electron is unpredictable. |
What is the electron cloud? | The regions where electrons are most likely to be found. |
What is the nucleus? | The central part of the atom which contains protons, atomic mass, neutrons, and a mass number. |
What is the atomic number? | The number of protons in the nucleus. |
What is a neutron? | small particles with no electrical charge. |
What is an electron? | Negatively charged particles found outside of the atom in the electron cloud. |
What is an ion? | an electrically charged atom or group of atoms. |
What is an isotope? | Atoms of an element w/ the same # of protons but whose neuton # differs. |
How does the the Gravitational force apply to atoms? | B/c atoms are so small the gravitational force is small. |
What is the Electromagnetic Force? | Opposites arrtact. Same charges repel. |
What is the strong force? | Prevents repulsion of protons in the nucleus. |
What is the weak force? | A neutron can trun into a proton and an electron. |