Question

Using the elements: Li, Al, Mg, I, S, & N.

Which of the following has the largest atomic radius? Which one of the following is a conductor? How do you list them from small atomic to large size? Which one of the following is the least metallic? What has the highest ionization energy? Which are non-metals? And which one has the highest electron affinity?

Answer 1

The atomic raddi increases as the nuclear charge on an atom increases and out of Li, Mg, Al, N, S and I, I has largest nuclear charge as it belongs to 5p orbital whereas, Li belongs to 2s, Mg to 3s, Al to 3p, N to 2p and S to 3p respectively.

Thus, Iodine has largest atomic radius.

Out of all these aluminium is good conductor because it is having 3p¹ configuration and it's easy to remove that particular electron. Thus, it is a good conductor.

Order of atomic size:

N < Li < S < Al < Mg < I

As, N is smallest in size because on moving from left to right in a period atomic size decreases whereas down the group atomic radii increases.

Out of these I is a non metal so it's least mettalic in nature.

Ionisation energy is the energy required to remove the outermost electron .

Out of all these iodine has highest ionisation energy because the energy required to remove the outermost electron is high because of electronegative nature.

Iodine, Nitrogen and sulphur are non-metals whereas lithium, magnesium and Aluminium are metals.

Electron affinity is the amount of energy released when an electron is added to an atom.

Thus, Iodine has highest electron affinity as it increases along a period.

Hope this helps you.