Question

define Moseley's periodic law and write about the position of hydrogen in the periodic table and how will you justify it

Answer 1

Moseley's law is an empirical law concerning the characteristic x-rays that are emitted by atoms. Until Moseley's work, "atomic number" was merely an element's place in the periodic table, and was not known to be associated with any measureable physical quantity.
Similar properties recur periodically when elements are arranged according to increasing atomic number." Atomic numbers, not weights, determine the factor of chemical properties.