(40) GCSE Chemistry Revision "Formula of Ionic Compounds"
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10 Terms
Ionic Compound
A compound formed from the electrostatic attraction between positively charged ions (cations) and negatively charged ions (anions).
NaCl
The formula for sodium chloride, an ionic compound composed of Na⁺ and Cl⁻ ions.
Charge Cancellation Rule
In an ionic compound, the total positive charge must equal the total negative charge to achieve an overall charge of zero.
MgI₂
The formula for magnesium iodide, formed from one Mg²⁺ ion and two I⁻ ions.
Li₂CO₃
The formula for lithium carbonate, composed of two Li⁺ ions and one carbonate ion (CO₃²⁻).
Ca(OH)₂
The formula for calcium hydroxide, consisting of one Ca²⁺ ion and two hydroxide ions (OH⁻), with brackets indicating two OH⁻ groups.
Nitrate Ion
A polyatomic ion with the formula NO₃⁻, commonly found in various ionic compounds.
Oxide Ion
A negatively charged ion (O²⁻) formed when oxygen gains two electrons.
Overall Charge
The total charge of a compound, which must be zero in an ionic compound.
Polyatomic Ion
An ion composed of two or more atoms that are covalently bonded and that carry a net charge.