Define a combination reaction. In combination reactions, or more elements or compounds combine to form one compound.

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

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it's c (engineer's do their work with mechanical stuff not on any living being)

5.6⋅10−^19  j

do you need the explaination?