An atom's outermost electron shell
A) is filled when it has three electrons.
B) determines its chemical reactivity.
C) determines its atomic mass.
D) is filled with positively charged particles.
E) is filled identically for every element.

Question

Quizplus · Accepted Answer

The outermost electron shell, also known as the valence shell, determines an atom's chemical reactivity. This is because it is the shell that interacts with other atoms in chemical reactions, making it important in determining an atom's ability to form bonds with other atoms.

An Atom's Outermost Electron Shell