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

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

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

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 formula of the stable binary compounds that would be formed by 
an element having atomic number 71 and fluorine: