Question

(a) Name three elements that have a single electron in their outermost shells.
(b) Name two elements that have two electrons in their outermost shells.
(c) Name three elements with completely filled outermost shells.

Answer 1

Answer:

a) hydrogen, lithium and sodium

b)beryllium, magnesium

c) helium, neon and argon

Answer 2

Inert Gases are Stable

Explanation:

(a) Lithium (Li), sodium (Na), and potassium (K) have a single electron in their outermost shells.  

(b) Magnesium (Mg) and calcium (Ca) have two electrons in their outermost shells.  

(c) Neon (Ne), argon (Ar), and xenon (Xe) have filled outermost shells.