Which of the following is true about internal energy of a system?

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

What is the volume of 2.5 moles of nitrogen gas (n2)at standard temperature and pressure (stp)?

Consider these four line graphs representing speed in meters/second, where each x-axis is labelled in seconds and each y-axis is labelled in meters. which line graph indicates the greatest speed at 5 seconds?