1. periodic law-law that states the physical & chemical properties of the elements are periodic functions of their atomic numbers 2. group-column of elements in the periodic table; family 3. family-column of elements in the periodic table; group 4.
period-horizontal row of elements in the periodic table 5. metal-element that is a good conductor of heat & electricity, is shiny, has a high melting point, tends to lose electrons 6. luster-shininess 7. ductile-able to be drawn into a thin wire 8. malleable-able to be hammered out into a this sheet 9.
corrosion-gradual wearing away of a metal due to a chemical reaction in which the metal element is changed into a metallic compound 10. nonmetal-element that is a poor conductor of heat & electricity, has a dull surface, low melting point, is brittle & breaks easy, and tends to gain electrons 11. metalloid-element that has properties of both metals & nonmetals 12. alkali metal-member of element Family 1 that has 1 valence electron 13.
alkaline earth metal- member of element Family 2 that has 2 valence electrons 14. transition metal-element that has properties similar to other transition metals and to other metals but whose properties do not fit in with those of any other family 15. boron family-Family 13 of periodic table; element has 3 valence electrons 16. carbon family- Family 14 of periodic table; element has 4 valence electrons 17.
The Essay on Atomic Mass Element Atoms Metals
Chapter Three Summary: Atoms and atom's structure Ancient Greek Philosophers suggested that matter was composed of individual particles, which was proved by the theory of John Dalton. The main provisions of his theory are: 1. All matter is composed of tiny, indivisible particles called atoms. 2. All atoms of a particular element are identical but the atoms of one element differ from the atoms of ...
nitrogen family- Family 15 of periodic table; element has 5 valence electrons 18. oxygen family- Family 14 of periodic table; element has 6 valence electrons 19. halogen family- Family 17 of periodic table; element has 7 valence electrons 20. noble gas- Family 18 of periodic table; element has 8 valence electrons and are extremely un reactive 21.
rare-earth element-general designation for those elements in the lanthanoid & actinoid series 22. lanthanoid series-first row of rare-earth elements in the periodic table; soft, malleable metals that have high luster & conductivity 23. actinoid series-.
