Which has more number of atoms and why?
100g of N2 or 100g of NH3​

100g of NH3 has more number of atoms

Explanation:

(i) 100g N2 contains =100/28 moles

Number of molecules=100/28×6.022×10^23

Number of atoms =100/286.022×10^23×2=43.01×10^23

(ii) 100g NH3=100/17 moles

Number of molecules =100/17×6.022×10^23

Number of atoms​       =100/17×6.022×10^23×4 atoms

                                    =141.69×10^23

∴ NH3 would have more atom...

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"the periodic table is arranged in order of atomic number."

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-