They mean: 2, 5, 3 and 10 respectively
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Two I II III etc
They refer to the valency of the metal in the compound, such as Iron II or Iron III chloride.
It is 2 in roman numerals. I = 1 II = 2 III = 3 IV = 4 and so on
II is 2 in Roman Numerals.
ii iii vi vii viii ix