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Gallium is not found as the free element in nature. Gallium ores are rare but gallium contaminates some other ores.

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Europium is never found in nature as the free element. Europium is found in the ores monazite sand [(Ce, La, etc.)PO₄] and bastn°site [(Ce, La, etc.)(CO₃)F], ores containing small amounts of all the rare earth metals.

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It seems to have an effect in the action of insulin. In anything other than trace amounts, chromium compounds should be regarded as highly toxic.

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Elemental lead is found in nature sparingly. Lead is present in ores such as galena (lead sulphide, PbS), anglesite (lead sulphate, PbSO₄), minim (a form of lead oxide with formula Pb₃O₄), cerussite (lead carbonate, PbCO₃) and other minerals.

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The British Pharmaceutical Codex from 1907 indicates that barium chloride ["barii chloridum", BaCl₂.2H₂O] has a stimulant action on the heart and other muscles. It was said that it "raises blood pressure by constricting the vessels and tends to empty the intestines, bladder, and gall bladder".

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The importance of sodium as salt in the diet was recognized well before sodium itself was understood to be an element. This recognition formed the basis of trading of salt deposits lining the Dead Sea in biblical times by the Romans.

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In part this may be because there is little gold in the biosphere with which living things might experiment and also because there are few ways for living things to convert gold into a suitable soluble form.

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Titanium metal is not found as the free element. The element is the ninth most abundant in the earth's crust.

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Helium is present in the atmosphere at about 0.0005% (1 part in 200000) by volume and is an important component within hydrocarbon gases in the USA.

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Iron is not found as the free metal in nature. The most common ore is haematite (iron oxide, Fe₂0₃). Iron is found in other minerals such as magnetite, which is seen as black sands along beaches.

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Carbon is found free in nature in three all of the tropic forms: amorphous, graphite, and diamond. Graphite is one of the softest known materials while diamond is one of the hardest.

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Calcium metal is never found as the free metal in nature. Calcium is fifth in abundance in the earth's crust, of which it forms more than 3%. It occurs as limestone (CaCO₃), gypsum (CaSo₄.2H₂O), and fluorite (CaF₂). Apatite is calcium fluoroscope or chloro phosphate. 20 Ca

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Both isotopes of Boron, B-10 and B-11, are used extensively in the nuclear industry. B-10 is used in the form of boric acid as a chemical shim in pressurized water reactors while in the form of sodium elaborateness it is used for standby liquid control systems in boiling water reactors. B-11 can be used as a neutron reflector.

Name boron Symbol B Atomic number 5

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symbol: Al
Atomic number 13 Aluminium may be involved in the action of enzymes such a succinic dehydrogenase and δ-aminolevulinate dehydrase (involved in porphyrin synthesis. Aluminium compounds are toxic to most plants and somewhat toxic to mammals. Aluminium has been linked to Alzheimer's disease (senile dementia).

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The atomic number of copper is 29. Copper is essential for all life, but only in small quantities. It is the key component of redox enzymes and of Mohammedanism. Copper is sometimes found as the free element and is present in many minerals.