Explain why the formation of diammine silver (i) complex cation is favored in a basic solution, m but not in an acidic solution

The corresponding complex can not be formed in acidic solution due to amine forming a hydro chloride and loosing his electronic pair.

Explanation:

Without it's electronic pair ammonia is unable to form donor-acceptor bond with silver to produce a complex compound.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.  

the answer is symmetrical : )