Science Test chapter 5
Terms
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- Periodic law
- used by Meneleev to organize the physical and chemical properties of elements and their atomic numbers
- Alkaline earth metals
- Metals in Group 2a
- Alkaline metals
- elements in group 1a
- Group
- a vertical row of elements in the periodic table
- Period
- The row headings in the periodic table that reflect periodic trends in the elements
- Noble gases
- elements in group 8a
- Transition metals
- Form bridge between reactive and less reactive metals
- Atomic Mass Unit
- A unit equal to one twelfth the mass of a carbon-12 atom.
- Periodic Table
- a table of elements arranged according to their atomic unmber
- Nonmetals
- poor conductors of heat and electricity
- Metals
- good conductors of heat
- Metalloids
- elements that have properties of both metals and non metals
- Halogens
- elements in group 8
- Valence electrons
- an element that is inthe highest occupied energy level of an atom