Plutonium Appearance & Characteristics. Radioactive and toxic. Plutonium is a silvery radioactive metal that tarnishes in air to give a yellow oxide coating. It has six allotropic forms, which vary widely in crystal structure and density. The metal is chemically reactive, forming compounds with the halogens, carbon, nitrogen, and silicon.
Rickets is a condition that affects bone development in children. It causes the bones to become soft and can lead to bone deformities. It is often characterised by an appearance of bowed legs. In adults, it is known as osteomalacia or soft bones.
The main cause of rickets is a lack of vitamin D. Not having enough calcium in one's diet may also be a cause of rickets, as may vomiting and diarrhea. Some childhood kidney and liver diseases can cause rickets, as may a digestive disorder complication that affects calcium and phosphorous absorption.ack of vitamin D-the main cause of rickets. Our bodies need vitamin D in order to absorb calcium from the intestines. Ultraviolet light (from sunlight) helps our skin cells convert vitamin D from an inactive into an active state.