Question
7. In which of the following compounds do the ions have the same electron arrangement? You may wish to use the data booklet to.help you. A Na_(2)O B LiF C KBr D MgCl_(2)
Answer
3.8
(309 Votes)
Bernadette
Professional · Tutor for 6 years
Answer
A
Explanation
## Step 1: Understand the problemWe are given four compounds and we need to identify which of them have ions with the same electron arrangement.## Step 2: Determine the ions in each compoundWe need to determine the ions present in each compound. ### Na2ONa2O is made up of Na+ and O2- ions.### LiFLiF is made up of Li+ and F- ions.### KBrKBr is made up of K+ and Br- ions.### MgCl2MgCl2 is made up of Mg2+ and Cl- ions.## Step 3: Determine the electron arrangement of each ionWe need to determine the electron arrangement of each ion. ### Na+Na+ has lost one electron from its neutral state, so it has the same electron arrangement as neon (2, 8).### O2-O2- has gained two electrons from its neutral state, so it has the same electron arrangement as neon (2, 8).### Li+Li+ has lost one electron from its neutral state, so it has the same electron arrangement as helium (2).### F-F- has gained one electron from its neutral state, so it has the same electron arrangement as neon (2, 8).### K+K+ has lost one electron from its neutral state, so it has the same electron arrangement as argon (2, 8, 8).### Br-Br- has gained one electron from its neutral state, so it has the same electron arrangement as krypton (2, 8, 18, 7).### Mg2+Mg2+ has lost two electrons from its neutral state, so it has the same electron arrangement as neon (2, 8).### Cl-Cl- has gained one electron from its neutral state, so it has the same electron arrangement as argon (2, 8, 8).## Step 4: Compare the electron arrangements of the ionsWe need to compare the electron arrangements of the ions in each compound to determine which compounds have ions with the same electron arrangement.### Na2ONa+ and O2- have the same electron arrangement as neon (2, 8), so Na2O has ions with the same electron arrangement.### LiFLi+ and F- have different electron arrangements, so LiF does not have ions with the same electron arrangement.### KBrK+ and Br- have different electron arrangements, so KBr does not have ions with the same electron arrangement.### MgCl2Mg2+ and Cl- have different electron arrangements, so MgCl2 does not have ions with the same electron arrangement.