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To determine the charge on an ion derived from each element using the group number, you need to consider the group number of the element on the periodic table.
For Lithium (Li), it belongs to Group 1 in the periodic table. Elements in Group 1 tend to lose 1 electron to achieve a stable electron configuration. Therefore, the charge on the ion derived from Lithium would be +1.
So, the correct answer for Lithium is:
+1
Understanding the group number of an element in the periodic table can help you predict the charge on the ion derived from that element. If you have any more questions or need further clarification, feel free to ask!