Term
| State the formula of common polyatomic ions formed by non-metal in period 2 and 3 |
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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 |
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Term
| Predict wether a compound of two elements would be ionic from their electronegativity values. |
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Definition
| If Electronegativity value's difference is greater than 1.8 units or more, in the Pauling scale, would give an ionic compound |
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Term
| Predict wether a compund of two elements would be ionic from the position of the elements in the periodic table |
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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. |
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Term
| Transition elements can form more that one ion, why? |
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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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