Question

An element has highest negative electron gain enthalpy in periodic table. In its outer most shell total
number of electrons are x and it has total p-electrons y. What will be the value of y-x.​

Answer 1

Answer:0

Explanation:

Most negative electron gain enthalpy is possessed by fluorine.

It has 5 p electrons, and the no. of valence electrons is also 5.

Therefore, y-x= 0

(Most probably)

Answer 2

The value of (y-x) is 4

Explanation:

Electron gain enthalpy is the energy released when an electron is added to a neutral isolated gaseous atom.

Chlorine is the most electronegative element in the periodic table and hence has highest negative electron gain enthalpy.

The electronic configuration of chlorine with 17 electrons is, $1s^22s^22p^63s^23p^5$

Number of electrons = 2 + 2 + 6 + 2 + 5 = 17 electrons

And as we know that atomic number is equal to the number of electrons. So, the atomic number is 17. The outer shell is 3 and it contains 7 electrons.

Thus x= 7.

Total p electrons = y= 6 +5 = 11

(y-x)= (11-7) = 4

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