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.
A recent study, published by researchers from the University of Kentucky, in the journal Free Radical Biology and Medicine, suggests that low levels of vitamin D may cause brain damage. recent study, published in the Journal of Alzheimerâs Disease, entitled Low serum vitamin D concentrations in Alzheimerâs disease: a systematic review and meta-analysis, found there to be low serum vitamin D levels in Alzheimerâs patients, relative to controls.