Ions - Polyatomic and common single Retake

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Cyanate

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CNO⁻ (a polyatomic ion consisting of carbon, nitrogen, and oxygen)

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Chromium (III) ion

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Cr³⁺ (a cation with a +3 charge, indicating it has lost three electrons)

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Iron (II) ion

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Fe²⁺ (a cation with a +2 charge, indicating it has lost two electrons)

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Calcium ion

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Ca²⁺ (a cation with a +2 charge, indicating it has lost two electrons)

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Iodide ion

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I⁻ (a monatomic ion formed when iodine gains one electron)

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Definition of a polyatomic ion

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An ion composed of two or more atoms bonded together, which can carry a positive or negative charge.

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Common polyatomic ions

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Examples include sulfate (SO₄²⁻), nitrate (NO₃⁻), and phosphate (PO₄³⁻).

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Charge of a calcium ion

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Ca²⁺ has a +2 charge, indicating it has lost two electrons.

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Difference between Fe²⁺ and Fe³⁺

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Fe²⁺ has lost two electrons, while Fe³⁺ has lost three electrons.

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What is the formula for the cyanate ion?

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CNO⁻.