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Ch. 17
Vocab
Term | Definition |
---|---|
Atom | the smallest piece of matter that still retains the property of the element. |
Nucleus | Protons and neutrons are found in a small, positively charged center of the atom |
Proton | are particles with an electrical charge 1+. |
Neutron | are neutral particles that do not have electrical charge. |
Electron | are particles with an electrical with of 1- |
Quark | Protons and neutrons, however, are made up of smaller particles |
Electron Cloud | the area around the nucleus of an atom where its electrons are molt likely found. |
Atomic Number | The number of protons in an atom is equal to a number |
Mass number | Atom is the sum of the number of protons and the number of neutrons in the nucleus of an atom. |
Isotope | Atoms of the same element that have different numbers of neutrons. |
Average Atomic Mass | 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 |
Group | The vertical columns in the periodic table |
Electron Dot Diagram | the symbol of the element and dots to represent the electrons in the outer energy level. |
Period | The horizontal rows of elements on the periodic table. |