How does a positive ion form?

Answer 1

By giving away an electron.

I'm assuming you are talking about ionic bonding. Elements on the left-most part of the periodic table of elements have one extra electron to the octet rule. This is why they want to give an electron away to something else, like a flourine atom. When the element gives off an electron, it gets a positive charge, making it a positive ion.

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Answer 2

Cooper Adams

An atom that loses one or more electrons forms a positive ion because the imbalance of positive and negative charges results in a net positive charge due to the atom's excess protons over electrons.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.