Answer: Because the acre is a measure of area, it has no definite perimeter. For example, using the examples in question one, the perimeter of the long, skinny sidewalk acre would be 17,434 feet (more than 3 miles), but the perimeter of the square acre would be 835 feet.
No other molecular fluoride of krypton has been isolated, so all krypton compounds are derived from KrF 2, where Kr is in the +2 oxidation state. Krypton difluoride is a powerful oxidative fluorinating agent. (Its oxidizing power means that it extracts electrons from other substances and confers on them a positive charge.
As everyone who is even remotely familiar with the DC comic universe knows, kryptonite is the one weakness of the otherwise indestructible Superman. Kryptonite is described as radioactive remains of Supermanâs home planet of Krypton and has not only detrimental effects on Superman but on other Kryptonians as well. As the Superman mythos developed, kryptonite was discovered to come in many different forms, each having their own unique effect on Superman.