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Which of the following is the chemical symbol for magnesium?
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2. Atoms & Elements
Periodic Table: Element Symbols
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Which of the following is the correct chemical symbol for iodine?
A
Io
B
In
C
I
D
Ir
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Understand that chemical symbols are one- or two-letter abbreviations for elements, where the first letter is always uppercase and the second letter, if present, is lowercase.
Recall that iodine is a halogen element with atomic number 53, and its correct chemical symbol is a single uppercase letter 'I'.
Review the options given: 'Io', 'In', 'I', and 'Ir'. Note that 'Io' is not a valid symbol, 'In' stands for indium, and 'Ir' stands for iridium.
Confirm that the correct symbol for iodine is simply 'I', which matches the standard chemical notation for this element.
Therefore, select 'I' as the correct chemical symbol for iodine.
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