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| Classified elements according to their atomic mass. |
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| Arranged the periodic table according to atomic number. |
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When elements are arranged in order of increasing atomic number, there is a periodic pattern in their chemical and physical properties. |
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| The arrangement of electrons according to energy. |
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| Horizontally in the periodic table |
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| Electrons which participate in chemical reactions. |
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| Conduct heat and electricity |
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| Have one valence electron and highly reactive. |
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| Have two valence electrons |
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| Inner transition which are radioactive |
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| Inner transitions which are shiny metals that are considered rare earth metals. |
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| Contain complete valence energy level |
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| Contain properties of both metals and nonmetals. |
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| Bond between metals and nonmetals forming salts or oxides. |
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| resulting from the loss of electrons |
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| resulting from the gain of electrons |
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| The amount of energy needed to remove an electron from the valence electrons. |
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| A measure of how tightly an atom holds onto its valence electrons. |
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| The attractive force between the positive protons in the nucleus and the negative elctrons in the energy levels. |
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| A measure of the energy levels between the valence electrons and the nucleus. |
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| Elements in groups 1,2,13-18 |
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| Being able to be pounded into sheets |
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| Property of metals being drawn into wire |
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| Atoms tend to gain, lose or share elctrons to acquire a full valence shell. |
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| Atom or bonded group of atoms that has a positive or negative charge. |
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| Lanthanide and actinide series |
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| Alkali and alkaline earth metals,hydrogen and helium |
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