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Question 2 Part A Of the following, which element has the highest first ionization energy? sodium...

Question 2

Part A

Of the following, which element has the highest first ionization energy?

sodium

magnesium

aluminum

silicon

Expert Solution

Ionization energy is the energy required to remove an electron from a gaseous atom or ion.

The first ionization energy of an atom or molecule is the energy required to remove one mole of electrons from one mole of isolated gaseous atoms or ions.

The order of firt ionization energy will be as follows

Na < Mg > Al < Si

The electronic configurations are as follows:

Na(At no,11) : 3s¹

Mg(At no,12): 3s²

Al ((At no,13): 3s²3p¹

Si (At no 14): 3s²3p²

The ionization enegy of Na will be lowest as it is very easy to remove one 3s elctron and gain the stable 1s²2s²2p⁶ configuration.

The ionization energy of Mg will be larger than that of Na due to fully filled stable 3s²configuration, it is difficult to remove the 1 st electron.

The ionization of Al will be smaller than that of Mg due to one electron extra than the stable configuration so it is easier to remove the 1 st electron than Mg.

Among all these four elements, Si has the highest 1 st ionization energy due to highiest effective nuclear charge.

queen_honey_blossom answered 2 years ago

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