Atoms of elements at the top of a group on the periodic table are smaller than the atoms of elements at the Bottom of the group. How does this help explain the difference in thee reactivity of metals within a group?

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the period of human evolution has coincided with environmental change, including ('hominin' refers to any bipedal species closely related to humans – that is, on how do we know earth's climate has changed? a map showing dates and locations of prehistoric archeological sites and migration routes from africa into.

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