the anion, larger is the ionic radius c) Atomic radius of the elements increases as one moves down the first group of the periodic table d) Atomic radius of the elements decreases as one moves across from left to right in the nd period of the periodic table. . Which one of the following arrangements represent the correct order of least negative to most negative electron gain enthalpy a) Al < O < C < Ca < F b) Al < Ca < O < C < F c) C < F < O < Al < Ca d) Ca < Al < C < O < F . The correct order of electron gain enthalpy with negative sign of F, Cl, Br and I having atomic number , , and respectively is a) I > Br > Cl > F b) F > Cl > Br > I c) Cl > F > Br > I d) Br > I > Cl > F .
Which one of the following is the least electronegative element? a) Bromine b) Chlorine c) Iodine d) Hydrogen . The element with positive electron gain enthalpy is a) Hydrogen b) Sodium c) Argon d) Fluorine . The correct order of decreasing electronegativity values among the elements X, Y, Z and A with atomic numbers , , and respectively a) Y > Z > X > A b) Z > A > Y > X c) X > Y > Z > A d) X > Y > A > Z 11th Std Chemistry 11th Std Chemistry - - - - .
Assertion: Helium has the highest value of ionisation energy among all the elements known Reason: Helium has the highest value of electron affinity among all the elements known a) Both assertion and reason are true and reason is correct explanation for the assertion b) Both assertion and reason are true but the reason is not the correct explanation for the assertion c) Assertion is true and the reason is false d) Both