Calcium is stored in a closed bottle but not under oil because it reacts with water less violently than potassium or sodium. Reactions of metals with dilute acid Tylecote, R. F. (1992). A History of Metallurgy, Second Edition. London: Maney Publishing, for the Institute of Materials. ISBN 978-1-902653-79-2. Archived from the original on 2015-04-02.

Walther, John V. (2013). Earth's Natural Resources. Jones & Bartlett Publishers. ISBN 978-1-4496-3234-2.

Hadhazy A. 2016, " Galactic 'Gold Mine' Explains the Origin of Nature's Heaviest Elements", Science Spotlights, 10 May 2016, accessed 11 July 2016.

The elemental metals have electrical conductivity values of from 6.9 × 10 3 S/cm for manganese to 6.3 × 10 5 S/cm for silver. In contrast, a semiconducting metalloid such as boron has an electrical conductivity 1.5 × 10 −6 S/cm. With one exception, metallic elements reduce their electrical conductivity when heated. Plutonium increases its electrical conductivity when heated in the temperature range of around −175 to +125°C. Gabriel, RA (1990). The Culture of War: Invention and Early Development. Westport CT: Greenwood Publishing Group. p.108. ISBN 978-0-313-26664-5.Most metals are solid at room temperature, but this does not have to be the case. Mercury is liquid. Alloys are mixtures, where at least one part of the mixture is a metal. Examples of metals are aluminium, copper, iron, tin, gold, lead, silver, titanium, uranium, and zinc. Well-known alloys include bronze and steel. Some metals, like steel, can be made sharp and stay sharp, so they can be used to make knives, axes or razors. Platinum, the third precious metal after gold and silver, was discovered in Ecuador during the period 1736 to 1744, by the Spanish astronomer Antonio de Ulloa and his colleague the mathematician Jorge Juan y Santacilia. Ulloa was the first person to write a scientific description of the metal, in 1748.