4 substances are mixed in test tube during a chemical reaction. The concentrations of the 4 substances are measured at 0s and at 100s

The  number  of valence  electrons that  Aluminium(Al) have for bonding  are  three (3)  valence  electrons

  Explanation

 aluminium  is in atomic number  13  which  means it has  13  electrons in its  atom.  Aluminium electronic  configuration  is therefore  2.8.3   or   [Ne] 3s^2 3P1.  From  electronic  configuration  aluminium has  three  valence electron   that is  the  three  electron  in the  last  subshell   of  aluminium.