The hydrogen atoms on earth did not form there. It formed in space not long after the Big Bang and so is almost as old as the universe itself.
Water is formed when a positively charged hydrogen atom reacts with a hydroxide ion. Hydride ions react with water to form hydrogen.
H2S is formed
Hydrogen itself is an atom. If that hydrogen atom were to lose/gain/share electrons it would become an isotope/ ion
When both -NH2 and -COOH replace hydrogen atoms on the same carbon atom, an amino acid is formed.
A hydrogen bond is a weak bond formed between two molecules or atoms. It is caused by an atom of hydrogen being attracted to spare electron pairs on a neighbouring atom.
1 proton and 1 neutron
A hydrogen bond.
The most common bond in hydrogen is a compound one.
Salt
Water is formed when 2 hydrogen ions (H+) join with one oxygen ion (O2-)
Yes it is a weak bond because the force of attraction is weak.
HCl is formed.