Mosely modified Mendeleev's periodic law based on his observation on the X-ray spectra of elements.
Analyse the following graph, between ionization enthalpy and atomic number. What do you observe from the graph? Give justification for your observation.

Mosely modified Mendeleev's periodic law based on his observation on the X-ray spectra of elements. State the modern periodic law.

Moseley modified Mendeleev's periodic law based on his observation on the x-ray spectra of elements.The IUPAC name of the element with atomioc number 109 is ……..

Ionization enthalpy and atomic radius are closely related properties. Analyse the following graph: What conculation can you derive from the graph regarding the first ionization enthalpies of alkali metals and noble gases ? Justyfy.

The reactivity of an element is very much related to its inoization enthalpy. Observe the following graph in wich the first ionozation enthalpies (delta_1H) of elements of the sercond period are ploptted agiains their atomic number (Z):

The reactivity of an element is very much related to its ionization enthalpy. Observe the following graph in which the first ionization enthalpies (DeltaH_1) of elements of the second period are plotted against their atomic numbers (Z): Identify the anomalour values and justify.

Observe figure the electronic configuration of the second period elements of the group from 13-18 given below. Analyse table 3.1 and find whether there is any relation between the number of shells in an atom and the number of periods?

Which of the following is not a merit of Mendeleev's original periodic table? a) Prediction of undiscovered elements and their properties b) Correction of atomic masses of a few elements c) Systematic arrangement of elements based on atomic mass d) Similar elements were placed in different groups e) Separate positions are given for isotopes f) Order of increasing atomic weight is not observed. The correct code is