The correct order of metallic character of elements B, Al, Mg and K is :
1. B > Al > Mg > K
2. Al > Mg > B > K
3. Mg > Al > K > B
4. K > Mg > Al > B
Considering the elements B, C, N, F, and Si; the correct order of their non-metallic character is :
1. B > C > Si > N > F
2. Si > C > B > N > F
3. F > N > C > B > Si
4. F > N > C > Si > B
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
The maximum number of elements that can be accommodated in the sixth period are :
The element named after Lawrence Berkeley Laboratory is:
Boron has lesser ionization enthalpy than Beryllium, because -
|1.||It is easier to remove electrons from p - a subshell than a filled s - subshell.|
|2.||The s-electron can be removed easier than the p-electron.|
|3.||Ionization enthalpy decreases with an increase in atomic number.|
|4.||Ionization enthalpy increases along the period.|
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 -