click below
click below
Normal Size Small Size show me how
chemistry:chapter 4
Term | Definition |
---|---|
atom | the smallest particle of an element that retains the identity of the element |
atomic mass | the weighted average of the masses of all of an element's isotopes |
atomic number | the number of protons in an atom |
Cathode ray | a glowing beam of electrons |
Dalton's Atomic Theory | the first supporting evidence of the existence of atoms |
electron | a negatively charged subatomic particle with a negligible mass, found outside the nucleus of an atom |
isotopes | atoms of an element with different numbers of neutrons and therefore different masses |
mass number | the number of protons and neutrons in an atom |
neutron | a neutrally charged subatomic particle found in the nucleus of an atom |
nucleus | a dense, positively charged, and centrally-located region in the atom |
proton | a positively charged subatomic particle found in the nucleus of an atom |
theory | well-tested, scientifically accepted explanation of a broad set of observations |