- X3+ ve Y2- iyonlarının elektron sayıları aynıdır. Y elementi 3. periyot VI A grubundadır.
Yukarıda verilen bilgilere göre, nötr X atomunun elekt-
ron dağılımındaki son terim aşağıdakilerden hangisidir?
A) 3s1
B) 3d1
C) 3p2
D) 4s1
E) 4s2

I think its A,B,D hope this help

  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-