What are the four main spheres of the earth system

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.

Explain that newton first law,second law and third law of motion?

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom