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14 Cards in this Set
- Front
- Back
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What is the free-element rule? |
ON of atoms in their natural form and of atoms in pure elements is zero |
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what is the ion rule? |
ON of a monatomic ion is equal to the charge of the ion |
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what is the zero-sum rule? |
sum of the ONs of all the atoms in a compound must be zero |
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generally in a covalent bond,what determines the oxidation number of the other elements in a compound? |
the element with the highest electronegativity |
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what rule number is the specific oxidation number rule? |
4 |
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what is rule 4A? |
Alkali metals (Group 1) always have an oxidation number of +1 |
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what is rule 4B? |
Alkali earth metals (Group 2) have an oxidation number of +2 |
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what is rule 4C? |
Hydrogen has a +1 ON unless bonded to a metal (-1) |
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what is a metallic hydride? |
a bond between hydrogen and a metal |
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what is rule 4D? |
oxygen has a -2 ON unless peroxide ion or bonded to fluorine (-1) |
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what is rule 4E? |
Halogens (Group 17) has a -1 ON |
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when halogens are bonded to nonmetals, which element is assigned the negative number? |
the element with the higher electronegativity |
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if one rules contradicts another, what is done? |
the rule listed first should be followed |
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what is used to write formulas of binary ionic compounds? |
criss-cross method |
