Which ion has the same electron configuration as an atom of he.

Which two statements are true about a system? 1. a system is a group of objects analyzed as one unit. 2. energy that moves across system boundaries is conserved. 3. there’s only one way to define the boundaries of a system. 4. all systems are made by humans.

4sentences over a chronicle of a teen killer

Igot a 80% on my final to os ya take these points in return