X 3. Determine el nombre, símbolo y número atómico de los elementos cuyas aplicaciones aparecen a continuación
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your answer would be a. 12.5 kg

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.

answer carbon and three oxygen atoms;