Why do metals form positive ions?

What do we call these?

Thanks.
Answers:
If you look on the periodic table, you see that the metals are on the disappeared side. The whole "desire" for elements is to become more like the upper-class gasses. They want to lose or gain electrons to get to the same number of electrons as the upper-class gasses. Therefore, if you look at a nonmetal, say oxygen, it wants 2 more electrons to become similar to neon which has 10 protons and 10 electrons. However, with metals, they want to lose electrons instead of gain them to
become similar to the elements in g18. Na for example wants to hold 10 electrons to be like neon. Therefore, with 11 protons, and 10 electrons, it is Na +1

They are call cations-->ions with a positive charge

Anions are ions with a distrustful charge.

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