A monatomic ion with a charge of +1 has an electronic configuration of 1s22s22p63s23p64s23d104p6. This ion is a(n) . What is the chemical symbol of the noble gas this ion is isoelectronic with? . What is the formula of the ion?

The ion is a monoatomic cation

The symbol of the noble gas is Krypton(Kr)

The formula of the ion is Br⁻

what is the question here. i think you messed up.

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.