Question

so we learned why group 1 atoms/elements have a positive +1 charge. why do you think group 2 metals have a +2 charge? trends for ionic charge they must lose 1 electron like group 1 they must lose 2 electrons therefore making them +2 they must lose 3 electrons. look at the picture of the model of a neutral atom (has not reacted with any other atoms) of oxygen. how many valence electrons does a neutral atom of oxygen have?

Explanation:

Step1: Recall electron - configuration concept

Elements aim to achieve a stable electron - configuration like noble gases. Group 2 metals have 2 valence electrons.

Step2: Analyze ion - formation

To achieve a stable electron - configuration, they lose these 2 valence electrons. Losing 2 electrons results in a + 2 charge.

Answer:

They must lose 2 electrons therefore making them +2