In a exothermic reaction, is heat transfered to or from the surrounding

Why is carbon ideal for making different compounds?

Which element would mostly likely have an electron affinity measuring closest to zero

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.