Flourine has electron affinity less than that of chlourine why?
confussion is if electrons in flourine are tightly packed means it has high density then when electron is added in it its remainig electron should repel it so more energy will b release then why its electeon affinity is low?

Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.