Which statement best describes the relationship between atoms and nuclear forces? (2 points) a Strong nuclear forces hold the nucleus of an atom together. Weak nuclear forces hold neutrons and electrons together. b Weak nuclear forces hold the nucleus of an atom together. Strong nuclear forces are responsible for breaking down atoms. c Weak nuclear forces hold small atoms together. Strong nuclear forces hold large atoms together. d Strong nuclear forces hold the nucleus of an atom together. Weak nuclear forces are involved when certain types of atoms break down.

  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-