The simple view of the bonding in methane You will be familiar with drawing methane using dots and crosses diagrams, but it is worth looking at its structure a bit more closely. There is a serious mis-match between this structure and the modern electronic structure of carbon, 1s 2 2s 2 2p x 1 2p y 1.
Lack of sun exposure: Lack of sun exposure is a major cause of low vitamin d level especially if you live in the northern us. Less likely would be lack of vitamin d in food, but also a possibility if you are on a very restrictive diet.
Low vitamin D levels can be found in people of all age group including small babies and the elderly. Some of the most common symptoms of low vitamin D are fatigue, muscle pain, joint pain, weight gain, headache, constipation or diarrhea, high blood pressure, etc. There are several factors that can contribute to this problem. Following are some of the prevalent causes of low vitamin D in the human body. â Lack of Exposure to Sunlight. The inner layer of the skin produces vitamin D using sunlight. If one does not have enough sun exposure, he or she may develop vitamin D deficiency.