Question

Write 2 favourable conditions for formation of anion​

Answer 1

The Condition required for the formation of an ionic bond between two Elements are:

The two elements must be of opposite charge, one negatively charged (anion) and the other positively charge (cation).

One of these elements must have high negative electron gain enthalpy(Anion).

Answer 2

Anions are the negative ions formed from the gain of one or more electrons.  When nonmetal atoms gain electrons, they often do so until their outermost principal energy level achieves an octet.  

All of these anions are isoelectronic with each other and with neon.  They are also isoelectronic with the three cations from the previous section.  Under typical conditions, three electrons is the maximum that will be gained in the formation of anions.

Outer electron configurations are constant within a group, so this pattern of ion formation repeats itself for Periods 3, 4,