Describe two observations a scientist could make by studying and testing fossils . Explain how each observation would increase our knowledge of the history of earth and its living organisms.

How are elements arranged in a periodic table

According to the valence shell electron pair repulsion (vsepr) theory, a molecule that has four electron groups around the central atom will exhibit what electron geometry? view available hint(s) according to the valence shell electron pair repulsion (vsepr) theory, a molecule that has four electron groups around the central atom will exhibit what electron geometry? trigonal bipyramidal tetrahedral square planar determination of electron geometry requires information on whether the electron groups are lone pairs or bonding groups.

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.