Final answer:
The ion charges of main group elements can be predicted using the group number and the octet rule.
Step-by-step explanation:
The statement is true.
Ion charges of main group elements can be predicted using the group number and the octet rule. When moving from left to right on the periodic table, main-group elements tend to form cations with a charge equal to the group number. For example, group 1 elements form 1+ ions, group 2 elements form 2+ ions, and so on.
On the other hand, when moving from right to left on the periodic table, elements often form anions with a negative charge equal to the number of groups moved left from the noble gases. For example, group 17 elements form 1- ions, group 16 elements form 2- ions, and so on.