Henry Moseley in 1913, studied X-ray spectra of large number of elements.
He observed that the frequency of X-ray emitted from an element is related to atomic number (Z) of an...
Elements present in the first period i.e., H and He contain only one shell which is also their valence shell and can accommodate maximum two electrons.
As first shell can accommodate only...
Correct option is: (A) atomic weights
According to Mendeleev's periodic law, the Physical and Chemical properties of elements are the periodic function of their atomic weight
Correct option is: (D) atomic numbers
According to Modern periodic law of elements, the variation in properties of elements is related to their atomic number.