Question

1. the current form of the periodic table was first developed in 1913 by dr. moseley and is based on ____.

o atomic number
o atomic mass
o number of neutrons
o ions

Explanation:

Henry Moseley's work in 1913 led to the modern - day periodic table being arranged based on atomic number. Atomic number is the number of protons in an atom's nucleus and is a more fundamental property for organizing elements compared to atomic mass or number of neutrons. Ions are atoms that have gained or lost electrons and are not the basis for Moseley's work on the periodic table.

Answer:

Atomic number