Question

Element with highest 2 ionisation enthalpy in periodic table

Answer 1

Answer:

Li

Explanation:

Answer 2

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Ionisation enthalphy: it is associated with the energy which is use to take out the most outer electron from its valence shell.

In going top to bottom in groups the first ionization enthalpy decrease.

And on going left to right in a period it increases.

So the highest I.E. is of Helium(He)

Explanation:

He has only 2 electron in its atom so due to small size it is really hard to take an electron out from it.

Facts:

° He is a noble gas which is the most stable state for an atom.

° He has fully filled outermost shell which is too close to nucleus