Classification ...

The atomic numbers of vanadium (V), chromium (Cr), iron (Fe) and Cobalt (Co)  are 23, 24, 26 and 27, respectively. Which one of these may be expected to have the highest second ionisation enthalpy? 

Electronic configuration of an element is:

d-Block Elements are characterized by the 

If the valence shell electronic structure of an element is ns²np⁵, then the element will belong to the group of

Atomic number of element Unnilhexium is:

Which of the following statements is false?

Which of the following statements is correct?

According to IUPAC nomenclature for elements with Z greater than 100,the root 'sept' corresponds to the digit:

To which group of the periodic table does the element with electronic configuration 1s², 2s², 2p⁶, 3s², 3p⁶, 3d¹⁰, 4s², 4p⁶, 4d¹⁰, 5s², 5p³ belong? 

Directions: The following question has four choices out of which ONLY ONE is correct.

Which of the following orders of elements is correct in terms of decreasing ionization enthalpies?

Which of the following elements has the greatest tendency to lose electrons?

Directions: The following question has four choices out of which ONLY ONE is correct.

The element whose configuration is 1s², 2s², 2p⁶, 3s² is

Directions: The following question has four choices out of which ONLY ONE is correct.

The first four ionisation energy values of an element are 191, 578, 872 and 5962 kcal. The number of valence electrons in the element is

Which of the following elements is a metalloid?

The elements with atomic numbers 4, 12, 20, 38 and 56 belong to the group of 

Select the pair(s) showing diagonal relationship.

The electronic configurations of four elements are given as follows.

(1) [Xe] 6s¹
(2) [Xe] 4f¹⁴, 5d¹, 6s²
(3) [Ar] 4s², 4p⁵
(4) [Ar] 3d⁷, 4s²

Which of the following statements about these elements is incorrect?

Which of the following ions has the highest value of ionic radius?

Which of the following series of elements is correct in terms of increasing atomic radii?

The ionisation energy of hydrogen atom is 13.6 eV. What will be the ionisation energy of He⁺?

According to IUPAC nomenclature,element Ununnillium have an atomic number of:

s-block elements comprise of

Iron triad of elements also contains

The third period (n = 3) begins at sodium with addition of first electron to

The screening effect of s orbital electron is

Diagonal relationship in the periodic table is shown by the elements of

Maximum number of electrons occupied by s,p and d orbitlas are:

If we have an element with atomic number 115, then which of the following statements is correct about this element?

From the ground state of electronic configuration of various electrons, which will have the highest second ionisation energy?

Metalloids show the properties of