Physical Properties - Ionization Enthalpy or Ionization Energy (IE) or Ionization Potential (IP)

Among the elements \[\ce{B, Al, C}\] and \[\ce{Si}\], which element has the highest first ionisation enthalpy? 

Among the second period elements the actual ionization enthalpies are in the

order Li < B < Be < C < O < N < F < Ne.

Explain why Be has higher Δ_iH than B?

Explain the following:

Ionisation enthalpy decrease in a group from top to bottom?

Consider the elements Mg, Al, S, P and Si, the correct increasing order of their first ionization enthalpy is ______.

Which of the following atoms has the highest first ionization energy?

Define ionisation enthalpy. Discuss the factors affecting ionisation enthalpy of the elements and its trends in the periodic table.

Those elements impart colour to the flame on heating in it, the atoms of which require low energy for the ionisation (i.e., absorb energy in the visible region of spectrum). The elements of which of the following groups will impart colour to the flame?

(i) 2

(ii) 13

(iii) 1

(iv) 17

How would you explain the fact that the first ionization enthalpy of sodium is lower than that of magnesium but its second ionization enthalpy is higher than that of magnesium?