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Periodic Table. What the PT really looks like. People. Mendeleev-Russian scientist that published the first modern PT based on atomic mass . Moseley-British scientist that rearranged the PT by atomic number. 2. Symbol-1, 2 letter abbreviation Element name Atomic Number-p+, e-
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People • Mendeleev-Russian scientist that published the first modern PT based on atomic mass. • Moseley-British scientist that rearranged the PT by atomic number
2 Symbol-1, 2 letter abbreviation Element name Atomic Number-p+, e- Atomic mass-Average mass of p+ and n in nucleus (Mass #) Element Squares 6 C Carbon 12.01
Periods • Horizontal rows • 7 periods • Periods correspond w/ # of energy levels an element has • The lanthanide and actinide series (on bottom) are pulled out and placed on the bottom to save space.
Groups/Families • Vertical columns • 18 groups • Also called families because each group has similar properties because they have the same # of e- in the outer energy level.
Metals • Shiny • Solid • Good conductors of heat and electricity • Malleable • Ductile • High Density • Almost 90 metals • Left side of PT (except H)
Nonmetals • Dull (not shiny) or powdery • Can be S, L, or Gas • Poor conductors of heat/electricity • Can’t be pounded (brittle) • Not ductile (wires) • Usually low density • Less than 20 • Right side of PT (except H)
Metalloids • Shiny or dull • Solid • Often used as semiconductors in computers • Not malleable • Not ductile • Density varies • 7 (shaded in) • Along stair step (not Al)
Alkali Metals • Group 1 • Highly reactive-never alone in nature • Soft, shiny, silver-white • Good conductors
Alkaline Earth Metals • Group 2 • Highly Reactive • Soft, silver-white, shiny • Give off bright colors when burned
Transition Metals • Found in middle of PT • Groups 3-12 • Not as reactive as alkali metals • Good for use in jewelry, pots, etc because not as reactive
Halogens • Group 17 • Very reactive nonmetals • Mostly gases
Noble Gases • Group 18 • Unreactive gases • Also called “inert”
Lanthanide Series • Classified as Rare Earth Metals • Found naturally on earth • Soft, silver-white malleable metals with high luster (shine) and conductivity. • Very reactive • Found on bottom of PT
Actinide Series • Radioactive • Most are man made