Answer : The balanced chemical reaction will be:

Explanation :
Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.
When solid calcium metal reacts with aqueous aluminum nitrate then it gives aqueous calcium nitrate and solid aluminium.
The balanced chemical reaction will be:

The mass numbers of the different isotopes of that element are averaged according to their respective abundances in nature.
Yes its possible bcz the chemical reaction doesn’t only happen in temperature
Group 6, sulfur, selenium and polonium.
Valence -2
This group also has valences 4 and 6.
This group also includes oxygen and tellurium.