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<text fn="Arial" fh="15" fc="16777215" fa="1" charset="238">Under standard conditions hydrogen is colourless gas, without smell and taste; it slightly dissolves in water.</text>
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<text fn="Arial" fh="15" fc="16777215" fa="1" charset="0">It was discovered in 1766 by a well known English chemist Henry Cavendish who called it öflammable airö. In 1883 it was condensed by </text>
<text fn="Arial" fh="15" fc="16777215" fa="1" charset="238">Karola Olszewski and Zygmunt Wr≤blewski.</text>
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<text fn="Arial" fh="15" fc="16777215" fa="1" charset="238">Three isotopes of hydrogen are known: protium</text>
<text fn="Arial" fh="15" fc="16777215" fa="1" charset="0">, deuterium and tritium</text>
<text fn="Arial" fh="15" fc="16777215" fa="1" charset="238">. They received separate names and symbols.</text>
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<text fn="Arial" fh="15" fc="16777215" fa="1" charset="238">Common hydrogen with mass number1 is called protium. Symbol H. </text>
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<text fn="Arial" fh="15" fc="16777215" fa="1" charset="238">Heavy hydrogen with mass number 2 is called deuterium. </text>
<text fn="Arial" fh="15" fc="16777215" fa="1" charset="0">Symbol D. </text>
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<text fn="Arial" fh="15" fc="16777215" fa="1" charset="238">Tritium, the heaviest isotop of hydrogen û mass number 3</text>
<text fn="Arial" fh="15" fc="16777215" fa="1" charset="0"> û is radioactive and unstable</text>
