A-monatomic-ion-with-a-charge-of-2-has-an-electronic-configuration-of-1s22s22p6-chemistry-homework-help

A monatomic ion with a charge of -2 has an electronic configuration of 1s22s22p6.

This ion is a(n) .

What is the chemical symbol of the noble gas this ion is isoelectronic with? . 

What is the formula of the ion? 

 
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