Metals that form more than one Monoatomic Ions

(Cr²⁺, Cr³⁺)

Chromium (II) and Chromium (III)

(Co²⁺, Co³⁺)

Cobalt (II) and Cobalt (III)

(Cu⁺, Cu²⁺)

Copper (I) and Copper (II)

(Fe²⁺, Fe³⁺)

Iron (II) and Iron (III)

(Pb²⁺, Pb⁴⁺)

Lead (II) and Lead (IV)

(Hg₂²⁺ and Hg₂⁺)

Mercury (I) and Mercury (II)

(Sn²⁺, Sn⁴⁺)

Tin (II) and Tin (IV)

1 mile

1.609 kilometers

1 yard

0.9144 meter

1 foot (ft)

0.3048 meter (m)

1 inch (in)

2.54 cm (exactly)

1 cubic foot (ft³)

0.02832 m³ (cubic meters)

1 gallon

3.785 dm³

1 quart

0.9464 dm³ or 946.4 cm³

1 fluid ounce

29.57 cm³

1 pound

0.4536 kg