Question

The elements on the far right of the periodic chart are not very reactive. They are known as the ______________ gases.

A. Noble
B. Halogen
C. Alkali
D. Transition

Answer 1

The unreactive elements on the far right of the periodic chart are known as the noble gases, specifically the elements in group 18. They are characterized by having a filled valence shell, making them inert. The correct answer is option a.

Step-by-step explanation:

The elements on the far right of the periodic chart are not very reactive and are known as the noble gases. The group 18 elements include helium, neon, argon, krypton, xenon, and radon. They have a filled valence shell, which makes them extremely unreactive, and they are often referred to as inert gases. It was once assumed that they did not form compounds at all until it was proven otherwise in 1962.

Let's address the individual components of the question:

• The energy needed to remove one electron from an atom is called ionization energy.
• A period is the name given to a horizontal row on the periodic table.
• A very reactive group of elements that is missing just one electron from their outer shells is the halogens, located in group 17.