Arrange the elements with the following electronic configurations in increasing order of electron affinity

For which of the following processes, enthalpy change is positive

Solution

Gaining of an electron by a gaseous atom is usually an exothermic process. Gain of second electron by negatively charged species feels a strong repulsion and the energy of the system increases.

Which of the following order is wrong?

Solution

Along the period, I.P. generally increases but not regularly. Be and B are exceptions. First I.P. increases in moving from left to right in a period,but I.P. of B is lower than Be.

Which electronic configuration of an element has abnormally high difference between second and third ionization energy?

Solution

Abnormally high difference between 2nd and 3rd ionization energy means that the element has two valence electrons, i.e., configuration (d)

The pair of elements having approximately equal ionisation potential is

Solution

In case of Ga there are 10 d electrons in the penultimate energy shell which shield the nuclear charge less effectively, the outer electron is held firmly by nucleus.As a result, the ionisation energy remains nearly the same as that of aluminium inspite of the fact that atomic size increases.

Which group is called buffer group of the periodic table ?

Solution

Zero group is also called as buffer group because it is placed between highly electropositive metals (group 1) and highly electronegative non-metals (group 17).

Electron affinity of X would be equal to

The correct order of acidic strength :

Solution

Acidic character of oxide Non-metallic nature of element.
Non-metallic character increases along the period.Hence order of acidic character is
Cl₂O₇ > SO₂ > P₄O₁₀

The species with a radius less than that of Ne is

Which of the following can not be isoelectronic?

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