(8) Naturally occurring magnesium has a relative atomic mass of 24.3. It is composed almost
entirely of Mg - 24 78.6%, Mg - 26 10.1% and a third stable isotope. Determine the
mass number of the third stable isotope.
Nations are commonly found in ionic compounds, whereas Na2+ ions are unknown in

answer

the ions in solute supperate from eachouthere

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

  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-