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Amit Saxena Grade: upto college level
         The statement that is not correct for the periodic classification of element, is 

a. The properties of elements are the periodic functions of their atomic numbers.
b. Non-metallic elements are lesser in number than metallic elements.
c. The first ionization energies of elements along a period do not vary in a regular manner with increase in atomic number.
d. For transition elements the d-subshells are filled with electrons monotonically with increase in atomic number.
3 years ago

Answers : (1)

Jitender Pal
askIITians Faculty
365 Points
										Sol. (a) Correct statement : According to Moseley’s law, the properties of elements are the periodic function of their atomic numbers.
(b) Correct statement : The whole s-block, d-block, f-block and heavier p-block elements are metal.
(c) Correct statement : Trent is not regular, Be has higher first ionization energy than B, nitrogen has higher first ionization energy than oxygen.
(d) Wrong statement : d-subshells are not filled monotonically, regularity break at chromium and copper.

3 years ago
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