Statement 1: Of all the elements, helium has the highest value of first ionization enthalpy.

It is given that: n(S) = 21, n(T) = 32, n(S ∩ T) = 11 We know that: n (S ∪ T) = n (S) + n (T) – n (S...

It is given that:  n(X) = 40, n(X ∪ Y) = 60, n(X ∩ Y) = 10  We know that: n(X ∪ Y) = n(X) + n(Y) – n(X ∩ Y)  ∴ 60 = 40...

(d) Electron gain enthalpy for noble gases is positive and it becomes less positive with increase in size of atom.  Value of electron gain enthalpy  He – 48 kJ mol–1, Ne –...

(a). Ar has highest first ionization enthalpy.

The electronic configurations of Na and Mg are: Na:1s2 2s2 2p6 3s1 And Mg: 1s2 2s2 2p6 3s2 thus, the first electron in both the cases has to be removed...

(a). The element chlorine (Cl) has the highest negative electron gain enthalpy.  (b). The element cesium (Cs) has lowest ionization enthalpy.  (c). The element fluorine F has lowest atomic radius.  (d). The element...

(a) Ge, Sn and Pb show divalency due to inert pair effect, Pb2+is more stable than Pb4+.  (b) Due to poor shielding effect of d-electrons in Ga, effective nuclear charge increases...

(c)Reason is correct explanation for assertion

(b) Correct explanation: in Al, 3p electron is to be removed while in Mg, a 3s electron is to be removed .