Hydrogen form compounds with elements having atomic number 9,11,12 and 17. Write the chemical formulae.

Hydrogen forms compounds with elements having atomic numbers 9, 11, 12 and 17. Mention their chemical formulae and compare their chemical behaviour.

Hydrogen forms compounds with elements having atomic number '9,11,12' and '17 .' What are their chemical formulae?

Hydrogen forms compounds with elements having atomic chemical formulas? Compare their chemical behaviour.