Among the second period elements the actual ionisation enthaply are in the order `Li lt B ltBe lt C lt O ltN lt F lt Ne.
`Expalin why Be has higher `Delta IH` than B.

Among the second period elements the actual ionisation enthaply are in the order Li lt B ltBe lt C lt O ltN lt F lt Ne explain why O has lower Delta IH than N and F ?

Some elementS are given. Li, Cs, Be, C, N, O F, l, Ne, Xe. a) Arrange the above elements in the increasing order of ionization enthalpy. b) Arrange the given elements in the decreasing order of negative electron gain enthalpy.

Find the true statement/statements a) In a given period Delta_(i)H_(1) is the lowest for an alkali metal and highest for noble gas. b) Cs has the lowest and He has the highest Delta_(i)H_(1) among all elements. c) Lowest Delta_(i)H_(2) among the elements of third period is for Mg. d) The metal with the highest Delta_(i)H_(1) is mercury. e) Ni (II) compounds are thermodynamically more stable than Pt(II) compounds while Ni(IV) compound are less stable than Pt(IV) compounds.

Function f(x) = |x| - |x - 1| is monotonically increasing when a) x lt 0 b) x gt 1 c) x lt 1 d) 0 lt x lt 1

Assertion : The second ionization energies of " "_(23) V,""_(24)Cr and,"" _(25)Mn are in the order V lt Cr lt Mn . Reason : Ionization energies show a regular increase along a period with increase of atomic number. a)If both (A) and (R) are correct and (R) is the correct explanation of(A). b)If both (A) and (R) are correct, but(R) is not the correct explanation of (A). c)If(A) is correct, but (R) is incorrect. d)If both (A) and (R) are incorrect.