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Sylas Murray
Chapter 5 Vocabulary
Term | Definition |
---|---|
period | A row in the table. |
group | A column in the table. |
periodic law | Repeating patterns. |
atomic mass unit | One twelfth of a carbon atom. |
metals | Good conductors of heat and electricity. |
transition metals | join elements on the right and left side. |
nonmetals | poor conductors of heat and electricity. |
matalloids | elements with properties that fall between metals and non metals |
periodic table | An arrangement of elements in columns based on properties. |
valence electron | the number of electrons in the outermost energy level. |
alkali metals | these metals have a single valence electron and are very reactive. |
alkaline earth metals | they all have two valence electrons. |
halogens | the elements in group 7A are called halogens. |
noble gases | The elements in group 8A are noble gases. |