What is the fixed position of hydrogen in the morden periodic why the carbon is taken as main reactant in covalent

How will you bring about the following conversions

The partial pressure of hydrogen in a flask containing 2 gram hydrogen and 32 gram of so2 isaugust 16 gram of oxygen at pressure p and the temperature of 400k in a small hole is made so that oxygen leak out how much oxygen leak out the partial pressure p by 2 and the temperature 300 kelvin ​

Pls give the best answer for this: if an atom loses an electron then why its valency is positive and not negative and if an atom accepts an electron why its valency is negative and not positive? for e. g. na(2,8,1) loses an electron to become 1+ instead of 1-