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Ch 5
| Question | Answer |
|---|---|
| elements that are poor conductors of heat and electric current. | nonmetals |
| a column of elements in a periodic table | group |
| a row in a periodic table of elements | period |
| the elements in a group 7A of the periodic table | halogens |
| one twelfth the mass of a carbon-12 atom | atomic mass unit (amu) |
| the pattern of repeating properties displayed by elements in the periodic table | periodic law |
| elements that are good conductors of heat and electric currents | metals |
| the elements in group 2A of the periodic table | alkaline earth metals |
| elements that form a bridge between elements on the left and right sides of the periodic tables. | transition metals |
| the elements in group 8A of the periodic table | noble gases |
| an electron that is in the highest occupied energy level of an atom | valence electrons |
| the elements in group 1A of the periodic table, not including hydrogen | alkali metals |
| elements with properties that fall between those of metals and nonmetals | metalloids |
| an arrangement of elements in columns based on a set of properties that repeat from row to row | periodic table |
| mendeleeve gave the name eka-aluminum to a.. | unknown element he predicted would have properties similar to those of aluminum |
| the usefulness of mendeleev's periodic table was confirmed by.. | the discovery of elements with predicted properties |
| mendeleeve leaves blanks in his periodic table to.. | match properties of elements above and below |
| two group 5A elements in fertilizer are.. | nitrogen and phosphorus |
| across a periodic table from left to right elements become ____ and ____ non metallic in their properties | less more |
| most common element in earths crust is____ | oxygen |
| mendeleevs strategy for classifying the elements was based on a _____ | card game |
| Mendeleev used the ____ of elements located near the spaces in his table to predict properties for undiscovered elements | properties |
| mendeleev increased his periodic table by increasing ____ while the modern periodic table is arranged by increasing ____ _____ | mass atomic number |
| the reactivity of alkali metals _____ from the top of group 1A to the bottom | increases |
| the properties of elements are more similar ____ __ _____ | within a group |
| an electron that is in the highest occupied energy level of an atom is a _____ electron | valence |
| one of the properties mendeleev predicted about eka-aluminum was its _____ | density |
| properties of elements repeat in a predicable way when atomic #'s are used to arrange elements into groups this pattern of repeating properties is called the _______ | periodic law |
| a column on the modern periodic table is known as a _____ and a row is known as a ____ | group period |
| most non reactive non metals | noble gases |
| most reactive metals | alkali |
| elements that have both metallic and non metallic properties | metalloids |
| reactivity of these materials is shown with water | alkaline earth |
| most reactive non metals | halogens |
| metals that often form colorful compounds | transition metals |
| group 1A | most reactive metals |
| group 2A | reactivity shown w/ in water |
| group 3A | least reactive |
| group 6A | most reactive |
| group 7A | most reactive nonmetals |
| group 8A | most non reactive non metals |
| mercury- toxic selenium- nerve damage | most harmful |
| most reactive is left, least reactive is right | location of most/ least reactive elements |