Question | Answer |
Law of Definite Propotions | A chemicl conmpoun is always made up of the same elements in the same proportions. |
Electrons | A negatively charged particle with an extremely small mass. Their speed and distance are jut right to keep them from being sucked into the nucleus. |
Nucleus | The center of an atom with contains protons and neutrons. |
Energy Levels | A region in an atom that contains electrons of a certain energy. |
Neutrons | A neutral particle in the nucleas of an atom, with approximately the same mass as a proton. Unstable particle that explodes in 17 minutes when removed from the nucleus, but is stable in the nulceus. |
Protons | A positively charged particle in the nucleus of an atom; 1836 times heavier than an electron. They stick together when they should be repelling each other with great force. |
Planetary Model | Created by Bohr. Electrons exist in specific engery levels. Represents the location of each electron as a general and indefinite, |
Quantum Model | Represents the location of electrons being present in cloud-like orbitals |
Orbitals | Regions of most probable location electrons. |
Atomic Mass | The total masses of the particles in an atom. |
Atomic Mass Unit (amu) | A unit used to measure the mass of an atom; one-twelth of the mass of a carbon012 atom |
Atomic Number | The number of protons in the nucleus of an atom. |
Mass Number | The sum of the protons and neutrons in the nucleus of an atom; also known as atomic mass. |
Isotopes | Different forms of the same element that have different numbers of neutrons |
Isotopic Notation | Shows both the atomic number and the mass number of the atom i.e.(13C4, 14C6) |
Atoms | Never wear out. Function flawlessly for thousands of years. Are continuously recycled. |
Democritus | Theory-All matter is made up of atoms.
Key Terms- Atom=indivisble(undividable) |
Bohr | Theory- Planetary Model
Key Terms- Electrons exist in specific energy levels |
Various Scientists | Theory-Quantum Model
Key Terms-Energy levels=Electron Cloud. Position of electron is uncertain. |