What would be the IUPAC name for an element with atomic number 222?

(a)

bibibiium

(b)

bididium

(c)

didibium

(d)

bibibium

Which of the following elements will have the highest electro negativity ____________

(a)

Chlorine

(b)

Nitrogen

(c)

Cesium

(d)

Fluorine

In the third period the first ionization potential is of the order.

(a)

Na > Al > Mg > Si > P

(b)

Na < Al < Mg < Si < P

(c)

Mg > Na > Si > P > Al

(d)

Na< Al < Mg < Si < P

Which one of the following arrangements represent the correct order of least negative to most negative electron gain enthalpy _______________.

(a)

Al < O < C < Ca < F

(b)

Al < Ca < O < C < F

(c)

C < F < O < Al < Ca

(d)

Ca < Al < C < O < F

The correct order of electron gain enthalpy with negative sign of F, Cl, Br and I having atomic number 9, 17, 35 and 53 respectively is _____________

(a)

I > Br > Cl > F

(b)

F > Cl > Br > I

(c)

Cl > F > Br > I

(d)

Br > I > Cl > F

What are isoelectronic ions? Give examples.

Define electro negativity.

Define modern periodic law.

Energy of an electron in the ground state of the hydrogen atom is -2.8 x 10^-18 J. Calculate the ionisation enthalpy of atomic hydrogen in terms of kJ mol^-1.

Justify that the fifth period of the periodic table should have 18 elements on the basis of quantum numbers.

Why halogens act as oxidising agents?

Explain the pauling method for the determination of ionic radius.

Why the first ionisation enthalpy of sodium is lower than that of magnesium while its second ionisation enthalpy is higher than that of magnesium.