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 calcium diet linked to higher risk of hormone condition in women. FULL STORY. A low calcium diet is associated with a higher risk of developing a common hormone condition in women, known as primary hyperparathyroidism, suggests a study published on bmj.com. advertisement Primary hyperparathyroidism or PHPT is caused by overactive parathyroid glands secreting too much parathyroid hormone, which can result in weak bones, fractures and kidney stones.