Which statement is true?

(1) the electronegative nature of elements increases along the period

(2) the electropositive nature of elements increases along the period

(3) the chemical reactivity of elements increases along the period

(4) the I.E  of element decreases along the period

Which of the electronic configuration of an atom has the lowest ionization enthalpy? 

(1) 1s²,2s²2p⁵

(2)1s²,2s²2p³

(3)1s²,2s²2$p^6$,3s¹

(4)1s²,2s²2p⁶

Which element has the greatest tendency to lose electron?

(a) F

(b) Fr

(c) S

(d) Be

In the long form of periodic table, the elements having lowest ionization potential are placed in:

(a) I group

(b) IV group

(c) VII group

(d) Zero group

Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionisation enthalpy?

                                                                                                              [2005]

(a) Vanadium (Z = 23)

(b) Chromium (Z = 24)

(c) Iron (Z = 26)

(d) Manganese (Z = 25)

The correct order of second ionization potential of carbon, nitrogen, oxygen and fluorine is

(1) C > N > O > F

(2) O > N > F > C

(3) O > F > N > C

(4) F > O > N > C

Generally the ionization enthalpy in a period increase but there are some exceptions. The one which is not an exception is-

(1) Be and B

(2) N and O

(3) Mg and Al

(4) Na and Mg

The First ionisation enthalpies of Na,Mg,Al and Si are in the order

1. Na<Mg>Al<Si

2. Na>Mg>Al>Si

3. Na<Mg<Al<Si

4. Na>Mg>Al<Si

Which one of the elements has highest ionisation energy?

1. [Ne]3s²3p¹

2. [Ne]3s²3p²

3. [Ne]3s²3p³

4. [Ar]3d¹⁰4s²4p²

The correct order of second ionisation energies of B, C, N, & O is

1. O > N > C > B

2. O > C > N > B

3. O > B > C > N

4. O > N >B > C