How do the elements in Groups 5A, 6A, & 7A form ions? They gain electrons to achieve noble gas configuration and form anions with a negative charge. What is the formula unit of Aluminum oxide?
Distal anhidrosis, although often subclinical, is detectable by clinical sudomotor testing in many patients with peripheral neuropathy. Diabetes mellitus, the most common cause of autonomic neuropathy in the developed world, typically impairs thermoregulatory sweating in a stocking and glove distribution. As the neuropathy progresses, asymmetric truncal anhidrosis or global anhidrosis may develop.
Atherosclerosis is the hardening and narrowing of the arteries due to the buildup of a waxy substance called plaque (plak). Rarely, infectionsâsuch as untreated syphilis (a sexually transmitted infection)âcan cause aortic aneurysms. Aortic aneurysms also can occur as a result of diseases that inflame the blood vessels, such as vasculitis (vas-kyu-LI-tis). A family history of aneurysms also may play a role in causing aortic aneurysms. In addition to the factors above, certain genetic conditions may cause thoracic aortic aneurysms (TAAs). Examples of these conditions include Marfan syndrome, Loeys-Dietz syndrome, Ehlers-Danlos syndrome (the vascular type), and Turner syndrome.