Which one of the following statements is true for an atom that has full s and p orbitals in its outermost energy level?

a. it's highly reactive only with halogens.
b. it has a stable octet and is unreactive.
c. it's highly reactive only with alkali metals.
d. it can be combined with most elements.

B. It has a stable octet and is unreactive.

Explanation:

s orbital contains 2 electrons and p contains 6. When the outermost energy level of an element has a total of 8 electrons we call it stable octet and it is unreactive. Therefore the answer is B

B.

Explanation:

For example the element with configuration

1s2 2s2 2p6 which is Neon, an inert.

It has a stable 8 electrons in its outermost shell which makes it stable.

the answer is Particles in the plasma move randomly, but particles in a solid vibrate in one place (B)