Ionic Bonding Brief version Ionic Bonding Two ions
Ionic Bonding (Brief version)
Ionic Bonding • Two ions with opposite charges (+ and -) are attracted to each other • An ionic bond is a chemical bond formed when atoms transfer electrons from one to another • Metal + Non-Metal • The positive ion is the one that donates the electron(s). The negative ion gains the electron(s)
Subscripts • Written to the bottom right of an element to indicate the number of atoms of that element that it has. • If no number is written, we assume that there is one atom.
Subscripts • Go only with the element it is beside unless there are parentheses. • If there are parentheses, distribute the number outside the parentheses to everything inside the parentheses. • Only use parentheses with polyatomic ions
Subscripts
Criss-Cross Rule To write the chemical formula for an ionic compound, write down the metal first and the non-metal second
Criss-Cross Rule • Next, find the oxidation numbers for both compounds involved. Write the oxidation numbers next to the two elements
Criss-Cross Rule • Cross the number from the superscript of one element to become the subscript of the other element.
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Ionic Bonding with Polyatomic Ions • When creating ionic compounds with polyatomic ions, pretend that the polyatomic ion is a regular ion. • If there is more than one set of a polyatomic ion, use parentheses when writing the formula
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