1.

Write a name of an element having variable valency.​

Answer»

Answer:

List of elements having variable valency

Explanation:

Iron : → ferrous - Fe 2+ → FERRIC - Fe 3+

Copper : → cuprous - Cu + → CUPRIC - Cu 2+

Mercury. → mercurous - Hg + → MERCURIC - Hg 2+

Gold. → aurous - Au + → AURIC - Au 3+

Silver. → argentous - Ag + → ARGENTIC - Ag 2+

Lead. → plumbous - Pb 2+ → plumbic - Pb 4+

Platinum. → platinous - Pt 2+ → platinic - Pt 4+

Tin.



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