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Chapter 17
vocabulary
Term | Definition |
---|---|
atom | is the smallest piece of matter that still retains the property of the element. |
nucleus | is surrounded by a cloud containing electrons. |
proton | are particles with an electrical charge of 1+ |
neutron | are neutral particles that do not have an electrical charge |
electron | are particles with an electrical charge of 1- |
quark | smaller particles that are made up of protons and neutrons |
electron cloud | is the area around the nucleus of an atom where its where electrons are most likely found |
atomic number | the number of protons in an atom is equal to a number |
mass number | an atom is the sum of the number of protons and the neutrons in the nucleus of an atom. |
isotope | atoms of the same element that have different numbers of neutrons |
average atomic mass | an element is the weighted-average mas of the mixture of its isotopes |
periodic table | a table of elements |
group | families the elements are in. |
electron dot diagram | uses the symbol of the element and dots to represent the electrons in the outer energy level. |
period | rows of elements on the periodic table that are horizontal. |