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

115.

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

Which of the following is the correct order of the size of iodine species?

• I > I^- > I⁺

• I^- > I > I⁺

• I⁺ > I > I^-

• I > I⁺ > I^-

First ionisation potential of Be and B will be

• 8.8 and 8.8

• 6.6 and 6.6

• 6.6 and 8.8

• 8.8 and 6.6