How do you know the charge of an element from the periodic table?

The position of an element on the periodic table (see Resources) tells you the type of ions it will form, with the elements on the right forming anions (negative charge) and those further to the left forming cations (positive charge). The first two groups have elements with only one or two electrons in their outer shells, group 1 and 2 respectively. These lose electrons to gain a charge of +1 or +2,

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