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How many numbers of lone pairs of electrons around the centeral atom does SO2 have? What nocturnal insect maks a low but high pitched call ascending in frequency? I have a pretty big rock, ripple on top and i countedat least 365 layers could it be worth anything:-)? Use Appendix Table for Normal Distribution to find area under Standard Normal Distribution curve to the right of z = -1.25? A periodic wave has a frequency of 7.4 Hz. What is the wave period?