Question

Which of the following elements is stable?

a. Boron, atomic number 5
b. Carbon, atomic number 6
c. Neon, atomic number 10
d. Fluorine, atomic number 9

Answer 1

Neon is the most stable because it has 8 valence electrons. when an element has full number of valence electrons, they become stable.

Answer 2

Neon, atomic number 10, is stable.

Step-by-step explanation:

Valencia electrons are the electrons found in the last electronic layer (called valence orbitals). These electrons are what determine the ability of the atom to form bonds. When an element joins another, it does so through its valence electrons.

The noble gases include the elements of group 18 of the periodic table. The noble gases are characterized by their very low chemical reactivity because they are very stable. This is because they have the full valence layer (complying with the octet rule, that is, they have 8 electrons at their last energy level, with the exception of helium that has 2 electrons), causing them to have a low tendency to capture or release electrons . That is why they are also called inert gases.

The Neon, whose atomic number is 10, belongs to the group of noble gases. So this element is stable.