Which term describes this reaction? addition condensation elimination substitution

Explanation:

Addition reaction is when two molecules combine to give one molecule

Condensation reaction is one which involves addition which is immediately followed by elimination of small molecules such as water and ammonia.

Elimination is the reverse of addition. It involves the removal of two atoms or groups of atoms from the same carbon atom or from different carbon atoms in a molecule.

Subsitution is the replacement of a particular group from a molecule.

answer: mercury

explanation:

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."