How many electrons does a Mn Mn atom have in its 3 d 3d subshell? number of electrons: 3 d electrons 3d electrons How many of those electrons are unpaired? number of unpaired electrons: unpaired electrons

a Mn atom has 5 electrons in its 3d subshell

All those 5 electrons are unpaired.

Explanation:

Step 1 : Data given

Mn = manganese

Manganese has atomic number 25

Step 2: Number of electrons

Since Manganese has atomic number 25, it means it has 25 electrons

It's complete electron configuration is 1s²  2s²  2p⁶  3s²  3p⁶  4s²  3d⁵

3d⁵ = This means a Mn atom has 5 electrons in its 3d subshell.

Since there are 5 orbitals in the 3d, each electron will occupy its own orbital (this is called the Hunds rule).

Before pairing begins, the 3d orbital must be filled parallel first.

This means all those 5 electrons are unpaired.

  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-