Give the number of valence electrons for each of the following: ba, al, p, se, br, k

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?

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Which of the following natural processes is most likely to support the formation of an underwater sinkhole? a pollution buildup from deposited minerals b limestone cave collapsing due to changes in sea level c erosion of large amounts of sand moved by ocean waves d oxidation of rock formed by chemical weathering