Write the chemical symbols for three different atoms or atomic cations with 29 electrons.

are atom and cations with 29 number of electrons.

Explanation:

1) An element with atomic number 29 is copper.Which means that there are 29 electrons and 29 protons present in an atom of a copper. And it is represented s Cu as it is a neutral atom no net charge on the atom will written.

2) Zinc has atomic number of 30 . which means that there are 31 electrons and 31 protons present in an atom of a nickel. If zinc atom looses 1 electron it total number of electrons changes to 29 and that is represent as.

3) Gallium has  has atomic number of 31 . which means that there are 30 electrons and 30 protons present in an atom of a nickel. If zinc atom looses 2 electrons it total number of electrons changes to 29 and that is represent as.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.