The representation below shows the outline formation of an electrovalent compound.

If the atomic number of element 'X' is 11 and of element 'Y' is 17 —

1. State why an electron is transferred from 'X' to 'Y' during the formation of 'X Y'
2. Give a reason why electrons are not shared between 'X' & 'Y' — during the formation of 'XY'
3. State the difference between 'X' and 'X¹⁺'
4. Does 'Y^1-' have a stable or an unstable electronic configuration.
5. If a compound is formed from atom A [at. no.19] and an atom Y [at. no. 17], would the compound 'AY' be an electrovalent or covalent compound. Give reasons.

1. As the electronic configuration of X is [2,8,1] and Y is [2,8,7], hence X donates one electron and Y accepts one electron in order to attain stable octet configuration. Hence, electron is transferred from X to Y.
2. Sharing of electrons mainly takes between a pair of non-metals and as X [2,8,1] is a metal and Y is a non-metal [2,8,7]. Hence, electrons are not shared between 'X' & 'Y' during the formation of 'XY'
3. X is a atom and has no charge, whereas X¹⁺ is cation and has a unit positive charge.
4. Y^1- has a stable electronic configuration [i.e., 2,8,8] as there are 8 electrons in the valence shell.
5. Electronic configuration of A is [2,8,8,1] and Y is [2,8,7], Hence A is a metal and Y is a non-metal. Therefore, there will be transfer of 1 valence electron from A to Y and the compound formed will be an electrovalent compound.