b. o2
oxygen is diatomic because 1 molecule is made of 2 atoms of oxygen
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In his version of the periodic table, Mendeleev based his arrangement of the elements on an element's atomic mass.
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Answer: Out of 118 elements, 94 occur naturally
Answer: here is what you would need
: A lemon, or other citrus fruit
:18 (or smaller) gauge copper wire
: Wire clipper
:A grown-up or older friend
:Steel paper clip, small galvanized nail (one that is covered in zinc), or a piece of zinc (ideal)
Explanation: i hope this helps