Balance the following chemical equation (which is for this reaction) and list the number of atoms of each element present before and after the reaction: nahco3 + ch3cooh → co2 + h2o + ch3coona

The balanced chemical equation will be;

NaHCO3 +  CH3COOH = CH3COONa + H2O + CO2

After balancing the chemical equation the number of atoms of each element is the same on the reactants and on the products side.

Sodium atoms - 1

Hydrogen atoms - 5

Carbon atoms - 3

Oxygen atoms - 5

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.