Question

Identify the noble gas that has atoms with the

same number of electrons as a chloride ion in
table salt.

Answer 1

Ar

Step-by-step explanation:

Chlorine has an atomic number of 17. That means that it has 17 protons and 17 electrons, thus being electrically neutral. When it gains 1 electron to form the chloride ion, the total number of electrons is 17 + 1 = 18.

Argon is a noble gas with an atomic number of 18, that is, it has 18 protons and 18 electrons.}

Then Cl⁻ has the same number of electrons as Ar.