Hydrogen gas is a colourless, odourless gas. It has a melting point of -259 C and a boiling point of 252.9 C, which means that it is gaseous at room temperature and pressure.
Hydrogen is the lightest element. It is also the most abundant element in the universe. It has an atomic number of 1, its nucleus contains just one proton and it has just one electron in its shell.
It is non-metallic. In its gaseous state it is present as two atoms bonded by a covalent bond in which the electron from each atom is paired up.
The gas is extremely flammable because hydrogen gas reacts readily with oxygen from the air when ignited by a spark to form water (H2O). This reaction can be explosive.
Hydrogen is sparingly soluble in water and does not react with either water or hydrochloric or sulphuric acid.
Hydrogen gas readily reacts in the dark with fluorine gas to produce hydrogen fluoride.
Hydrogen is the lightest element. It is also the most abundant element in the universe. It has an atomic number of 1, its nucleus contains just one proton and it has just one electron in its shell.
It is non-metallic. In its gaseous state it is present as two atoms bonded by a covalent bond in which the electron from each atom is paired up.
The gas is extremely flammable because hydrogen gas reacts readily with oxygen from the air when ignited by a spark to form water (H2O). This reaction can be explosive.
Hydrogen is sparingly soluble in water and does not react with either water or hydrochloric or sulphuric acid.
Hydrogen gas readily reacts in the dark with fluorine gas to produce hydrogen fluoride.