Question

When a sodium atom reacts with a chlorine atom to

form a compound, the electron configurations of the
ions forming the compound are the same as those in
which noble gas atoms?

1) krypton and neon
3) neon and helium
2) krypton and argon
4) neon and argon

Answer 1

4) Neon and Argon

Step-by-step explanation:

Sodium has 11 electrons, Chlorine has 17.

For both of them to complete their shells Sodium will give one electron to chlorine.

Sodium will become 2,8 in the reaction.

Chlorine will become 2,8,8 in the reaction.

2,8 is the electron configuration of Neon.

2,8,8 is the electron configuration of Argon