The correct order of their chemical reactivity of the elements F, Cl, O and N in terms of oxidizing property is :

1. F > Cl > O > N

2. F > O > Cl > N

3. Cl > F > O > N

4. O > F > N > Cl

Considering the elements B, C, N, F, and Si; the correct order of their non-metallic character is :

The correct order of metallic character of elements B, Al, Mg and K  is :

Incorrect statement among the following is-

1) Elements are classified into periods and groups

2) Elements with similar properties are placed in the same group

3) This makes the study of elements simpler

4) Elements are placed according to decreasing atomic number

The maximum number of elements that can be accommodated in the sixth period are :

1.  8

2. 18

3. 32

4 16

The element named after Lawrence Berkeley Laboratory is: 

Boron has lesser ionization enthalpy than Beryllium, because -

Difference between electron gain enthalphy and electronegativity is described by :

1) Valence electrons

2) Atomic size

3) Atomic radii

3) Atomic number

Incorrect statement about metal is:

1. Metals can donate electrons.
2. Metals form ionic compounds.
3. Metals are more electronegative.
4. Metals have less ionization energy.

The group number that has non-metal, liquid as well as gas at room temperature, is -