The periods and groups on the periodic table are numbered. For example element Francium (Fr) is in period 1, group Fr is very reactive metal and t
does react violently with water. Which of the following elements is likely
properties that are similar to those of Fr?

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.

As air becomes more dense, (select all that apply) o. air weighs less o. gas molecules are closer together o. air is colder o. air weighs more o. gas molecules are further apart o. air is hotter

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