As you pass the border (steps) on the periodic table, the atoms tend to form negative ions. Why is this so?

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This is because they want to gain more electrons to become stable. Nonmetals tend to gain electrons more than lose them. Moreover, Ions form in such a way so that the  ion will have the same number of electrons as a noble gas. Take oxygen, for example.  Oxygen has 8 electrons. To become like a noble gas it could either gain two to become  like neon or it could lose six to become like helium. So what will oxygen do—gain two or lose six? As a general rule, atoms will gain or lose the fewest number of electrons  possible.

Explanation:

if you mean hydrogen and oxygen then water is the product