Answer:
Option 4, [tex]O^{2-}[/tex]
Explanation:
Step 1: Determine which option is correct
We know that Ne has 10 electrons therefore we need to find a different ion that has the same amount.
Option 1 → Ca has 20 electrons and with 2+ we would remove 2 of those which would leave us with 18.
Option 2 → Cl has 17 electrons and with a - we would add 1 of those which would leave us with 18.
Option 3 → Li has 3 electrons and with a + we would remove 1 of those which would leave us with 2.
Option 4 → O has 8 electrons and with a 2- we would add 2 of those which would leave us with 10.
Since the only one that matches up in the number of electrons is [tex]O^{2-}[/tex] we can conclude that option 4 is correct.
Answer: Option 4, [tex]O^{2-}[/tex]
