Has 9 protons and 9 electrons in per atom.........
<em>Yes</em> the blood cells have a rigid of cell walls as their cell walls are cell membrane.
Bond dissociation energy is inversely proportional to Bond length.
The longer the bond is, lesser the energy it requires to break the bond.
Therefore, it is easier to break single bond.
Single bond>double bond>triple bond -------(Bond length)