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Chapter 17 vocab
vocabulary
Term | Definition |
---|---|
atom | the smallest piece of matter |
nucleus | center of an atom |
proton | particles with an electrical charge of 1+ |
neutron | neutral particles that do not have an electrical charge |
electron | particles with an electrical charge of 1- |
quark | smaller particles |
electron cloud | the area around the nucleus of an atom where its electrons are most likely found |
atomic number | the number of protons in an aom is equal to a number |
mass number | the sum of the number of protons and the umber of neutrons in the nucleus of an atom |
isotopes | atoms of the same element that have different numbers of neutrons |
average atomic mass | an element is the weighted-average mass of the mixture of its isotopes |
periodic table | the elements are arranged by increasing atomic number and by changes in physical and chemical properties |
groups | families |
electron dot diagram | the symbol of the element and dots to represent the electrons in the outer energy level |
periods | the horizontal rows of elements on the periodic table |