# Using the periodic table, how would you predict the charges of the ions of the following elements?

## GA SR As Br Se

Jul 27, 2017

see below

#### Explanation:

The question is very compless. Ga and Sr are two metals; they have in the last energetic level a number of electrons given from the number of the column of periodic table in which they lay;
then Sr has two electrons that can lose and becomes $S {r}^{2 +}$ while Ga becomes $G {a}^{3 +}$ .

Br an Se are non metals and they try to purchase electrons to complete their octet, becoming anions. Br in the seventh column A (or XVII) has 7 electrons and becomes $B {r}^{-}$ while Se in the sixth column A(XVI) has 6 electrons and purchasing two electrons becomes $S e \left(2 -\right)$.

They can also form anions bonding themselves with oxygen $\left(B r {O}^{-} , B r {O}_{2}^{-} , B r {O}_{3}^{-} , B r {O}_{4}^{-}\right)$ giving respectively to oxigen 1,2,3,4 electronic doubles.

Se, with oxygen can also forms $S e {O}_{2}^{2 -} , S e {O}_{3}^{2 -} ,$
As is an anphoteric element and can give thre of its 5 electrons as metal (As^3+) or can form anions with oxigen $\left(A s {O}_{2}^{-} , A s {O}_{3}^{-}\right)$ as Br and Se.
I hope to have helped you sufficiently