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The statement that is not correct for th...

The statement that is not correct for the periodic classification of elements 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 ionisation 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.

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 ionixation 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.

Text Solution

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The correct Answer is:
D
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ALLEN-QUANTUM NUMBER & PERIODIC TABLE-J-ADVANCED EXERCISE
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  2. Arrange the following in increasing order of basic strength : MgO,Sr...

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  3. The statement that is not correct for the periodic classification of e...

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  4. Ca^(2+) has a smaller ionic radius than K^(oplus) because it has "………"...

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  5. The basic nature of hydroxides of group 13 (III-A) decreases progressi...

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  6. Moving from right to left in a periodic table, the atomic size is :

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  7. The increasing order of electronegativity in the following elements :

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  8. One element has atomic weight 39. Its electronic configuration is 1s^(...

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  9. The number of paired electrons in oxygen atom is :

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  10. The decreasing size of K^(+),Ca^(2+),Cl^(-) & S^(2-) follows the order...

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  11. Which of the following has the maximum number of unpaired electrons ?

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  12. The incorrect statement Among the following is A)The first ionisation...

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  13. Li^(+),Mg^(2+),K^(+),Al^(3+) (Arrange in increasing order of radii)

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  14. Which one of the following statement (s) is (are) correct?

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  15. The electrons identified by the following quantum numbers n and l: (i)...

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  16. Gaseous state electronic configuration of ntrogen atom can be represen...

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  17. The electronic configuration of an element is 1s^(2), 2s^(2), 2p^(6), ...

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  18. Statement-1 : F arom has a less negative electron gain enthalpy than C...

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  20. The IE of Be is greater than that of B.

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