Periodicity Chapters 6 and 10 Key terms from both chapters and sentences should be in your notebook by Monday. Outlines should be in your notebook before Winter Break.
This is what Mendeleev knew in 1869. +1 +2 +3 +4 -2 Mendeleev predicted that eke-silicon and eke-boron would be discovered, (the atoms in purple). They were discovered soon after his prediction was made. 50 years later, Moseley’s work with X-rays improved upon the Periodic Table. Mendeleev noted patterns in the combining ratios of elements The Elements Lithium (Li), Sodium (Na), and Potassium (K) all formed oxides in the ratio of two atoms per oxygen atom: R2O The Elements Beryllium (Be), Magnesium (Mg), and Calcium (Ca) all formed oxides in the ratio of one atom per oxygen atom: RO Boron (B) and Aluminum (Al) formed R2O3 Carbon (C) and Silicon (Si) formed RO2 Recognizing the patterns of combining ratios or "valency", Mendeleev created a table organized by placing elements with similar combining ratios in the same group. He arranged the elements within a group in order of their atomic mass. http://web.fccj.org/~ethall/2045/ch5/mendelev.htm http://www.chemistry.co.nz/mendeleev.htm
http://www.genesismission.org/educate/scimodule/cosmic/ptable.html Try this web site if you want to get your money’s worth from our government! Periodic Law The properties of the elements are a periodic function of their atomic numbers. Elements with similar electron configurations are in the same column. These elements have similar chemical behavior. The way the behavior varies is predictable. http://www.chemistrycoach.com/periodic_tables.htm A comprehensive list of resources about periodic tables
Transition Metals Alkaline Earth Metals Inner Transition Metals Alkali Metals
Alkali Metals end in s1 react with water to form hydrogen gas and a hydroxide base. react with salts to form other salts. conduct heat and electricity gives electrons in chemical reactions. shiny, malleable, ductile,… in the uncombined form.
Alkaline Earth Metals end in s2 may react with water to form hydrogen gas and a hydroxide base. Reacts with acid to form hydrogen gas and a salt. react with salts to form other salts. conduct heat and electricity gives electrons in chemical reactions shiny, malleable, ductile,… in the uncombined form.
Transition Metals end in s2dn may react with acid to form hydrogen gas and a salt. react with salts to form other salts. conduct heat and electricity shiny, malleable, ductile,… in the uncombined form. gives electrons in chemical reactions Many of these make colorful compounds.
Inner Transition Metals end in s2fn may react with acid to form hydrogen gas and a salt. may react with salts to form other salts. conduct heat and electricity shiny, malleable, ductile,… in the uncombined form. gives electrons during chemical reactions. Many of these (if not all) are radioactive.
Metalloids end in s2pn may react with salts to form other salts. may or may not conduct heat and electricity may or may not be shiny, malleable, ductile, dull, brittle,… in the uncombined form. Many of these are semiconductors and are used in computers. SiO2 is sand, glass, super-ball, breast implant – depending on how it is processed.
Nonmetals end in s2pn may react with salts to form other salts. do not conduct heat and electricity may be dull, brittle,… in the uncombined form. May react by sharing electrons or taking electrons. May be solid, liquid, or gas.
Noble Gases end in s2p6 are gases do not generally engage in chemical reactions.
You will present your topic in three days. This is worth 100 points Each Group will work with one periodic property. It will be your job to explain your topic so your classmates feel comfortable with it. Page 251 255: Atomic and ionic radii P258 262: Ionization energy and reaction tendencies P 255 257: Electron configuration and its relation to oxidation numbers (also p141155) P 263: Electron affinity and reaction tendencies. What is it? Define Concept Illustrate Concept Apply Concept. How can I picture what you describe? What affect does this have?