Question

Why there is fall in the ionisation energy of Al and S in the same period?

Answer 1

Answer:

Ionization energy generally increases across period 3 because the nuclear charge increases but the shielding of the outer electrons remains relatively the same. ... The first is between Mg and Al, because the outer electron of Mg is in the orbital 3s, whereas that of Al is in 3p.

ʜᴏᴘᴇ ɪᴛ ʜᴇʟᴘs ᴜ ᴅᴇᴀʀ.... ᴋᴇᴇᴘ sᴍɪʟɪɴɢ.... ✌️❤

Answer 2

Explanation:

Ionization energy generally increases across period 3 because the nuclear charge increases but the shielding of the outer electrons remains relatively the same. ... The first is between Mg and Al, because the outer electron of Mg is in the orbital 3s, whereas that of Al is in 3p.

also

Now, E.C. of Mg and P are stable due to which large amount of energy is required to remove an electron but for Al and S less amount of energy is required as they have unstable E.C.