Must contain: 6 protons, 6 electrons and 12 neutrons.
The metals are to the left of the line (except for hydrogen, which is a nonmetal), the nonmetals are to the right of the line, and the elements immediately adjacent to the line are the metalloids.
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O2 gas, where there are two Oxygen atoms which are covalently bonded together
Period are going left to right across the periodic table
Groups are going up to down on the periodic table
<span> 2 hydrogen atoms attached to an oxygen atom.</span>