The repeating periodicity of the blocks of 2, 6, 10, and 14 elements within sections of the periodic table arises naturally from the total number of electrons that occupy a complete set of s, p, d and f atomic orbitals, respectively, although for higher values of the quantum number n, particularly when the atom in question bears a positive charge, the energies of certain sub-shells become very similar and so the order in which they are said to be populated by electrons (e.g. Cr ...
Bursitis (sore toes) A bursa is a small fluid-filled sac located near a joint, bone or tendon which protects the area from friction. Bursitis is an inflammation of the bursa, and commonly occurs in the little toe. If your toe feels 'squidgy' and is causing you pain, bursitis may be the cause.
Stress fractures are a common cause of pain on top of the foot. Metatarsal fractures are also a common cause. Fractures can be caused by repetitive movements, weak muscles, improper alignment of the bones in the lower extremity, arthritis, reduced bone density, and injury or trauma.