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Chemistry
11th Grade
12/11/2011

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Term
State the formula of common polyatomic ions formed by non-metal in period 2 and 3
Definition
With polyatomic ions, if the formula contains more that 1 ion, you need to use brackets around the ion
Ex: Calcium hydroxide: Ca(OH)2
Ex: Ammonium sulfate: (NH4)2SO4
Term
Predict wether a compound of two elements would be ionic from their electronegativity values.
Definition
If Electronegativity value's difference is greater than 1.8 units or more, in the Pauling scale, would give an ionic compound
Term
Predict wether a compund of two elements would be ionic from the position of the elements in the periodic table
Definition
One element will usually be a metal on the left of the Periodic table and the other a non metal on the right. Tendency to lose electrons increases down a group, tendency to gain electrons increases up a group.
Term
Transition elements can form more that one ion, why?
Definition
Transition elements have an electron configuration that enables them to lose different numbers of electrons from their d-subshell, and so form stable ions with different charges
Ex: Fe2+, Fe3+
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