Which is responsible for the diagonal relation of lithium with magnesium?

• Less ionic radii

• High polarising power

• Approximately equal electronegativity and affinity

• All of the above

In the modern periodic table the place of the element with atomic number 31 is in

• s- block

• d-block

• p- block

• f- block

Which of the following does not exhibit the periodicity in properties of the elements?

• Ionisation energy

• n/p ratio

• Electronegativity

• Atomic radius

The correct sequence of decrease in size of the following species is

• I> I⁺> I^-

• I> I^-> I⁺

• I⁺> I^-> I

• I^-> I> I⁺

The decreasing order of the ionisation potential in the following elements is

• Ne> Cl>P> S>Al>Mg

• Ne> Cl> P> S> Mg> Al

• Ne> Cl> S>P> Mg> Al

• Ne> Cl> S>P> Al> Mg

Which of the following represents the electronic configuration of the most electropositive element?

• [He]2s¹

• [He]2s²

• [Xe]6s¹

• [Xe]2s²

First ionisation potential is highest for

• Na

• Mg

• Al

• None of these

In the following, the element with the highest electropositivity is

• copper

• cesium

• barium

• chromium

The number of unpaired electrons is maximum in (Atomic number Ti = 22; V= 23; Cr =24; Fe=26)

• Fe

• Cr

• Ti

• V

On moving from left to right in the second period along the periodic table the gram atomic volume of the element

• increases with constant velocity

• remains unchanged

• first increases and then decreases

• decreases