Usually scientists looking for life on other planets try to determine first if the planet had or has evidence of water. Develop a rationale for this based on cellular chemistry

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.

it means there are 3 atoms of oxygen

it would be d. henry moseley

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