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  1. Explanation:

    The periodic table, also known as the periodic table of elements, is a tabular display of the chemical elements, which are arranged by atomic number, electron configuration, and recurring chemical properties. The structure of the table shows periodic trends. The seven rows of the table, called periods, generally have metals on the left and nonmetals on the right. The columns, called groups, contain elements with similar chemical behaviours. Six groups have accepted names as well as assigned numbers: for example, group 17 elements are the halogens; and group 18 are the noble gases. Also displayed are four simple rectangular areas or blocks associated with the filling of different atomic orbitals.

  2. The answer is C. Because you see the pattern on both sides which shows that it must be spreading from the middle out as new crust rises.

  3. i think
    D. As oceanic crust sank beneath other oceanic crust, the cooling rocks aligned with the earth's magnetic field, which periodically reversed. This periodic pattern was seen on one side of a mid-oceanic ridge

  4. It has all the chemical elements organized by atomic #, from the element w the lowest atomic # , hydrogen, the element w the highest atomic # & by oganesson

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