
All noble gases are
(A) colourful
(B) colourless and odourless
(C) colourless and but have odour
(D) none of these
Answer
435.6k+ views
Hint: Symmetry and exchange energy are the causes for the greater equilibrium of atoms with half-filled or totally filled orbitals. - We realise that half-filled or completely filled atomic orbitals have more symmetry than any other electronic structure, which adds to the atom's increased stability.
Complete answer:
The noble gases (historically known as inert gases; also known as aerogenes[1]) are a group of chemical elements with identical properties; they are all odourless, colourless, monatomic gases of very low chemical reactivity under normal conditions. Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and nuclear radon are the six naturally occurring noble gases (Rn). Oganesson (Og) has been speculated to be a noble gas or to defy the trend due to relativistic effects; however, its composition has yet to be studied.
Under normal conditions, noble gases are colourless, odourless, tasteless, and nonflammable.
The noble gases are grouped in the periodic table according to their boiling point.
Noble gases are used in a variety of applications, ranging from incandescent lamps to excimer lasers.
Xenon is used as an anaesthetic because of its high lipid solubility, which makes it more active than nitrous oxide and because it is quickly eliminated from the bloodstream, allowing for quicker healing.
Via hyperpolarized MRI, xenon is used in medical imaging of the lungs.
In radiotherapy, radon is used, and is extremely radioactive and only present in trace quantities.
Hence option (B) is correct.
Note:
The properties of noble gases are well explained by contemporary atomic structure theories. Noble gases have a "full" outer shell of valence electrons, which makes them less likely to engage in chemical reactions. Just a few hundred noble gas compounds have been prepared so far. For eg, both the n = 1 and n = 2 shells of Neon (Ne) are complete, making it a stable monatomic gas under atmospheric conditions.
Complete answer:
The noble gases (historically known as inert gases; also known as aerogenes[1]) are a group of chemical elements with identical properties; they are all odourless, colourless, monatomic gases of very low chemical reactivity under normal conditions. Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and nuclear radon are the six naturally occurring noble gases (Rn). Oganesson (Og) has been speculated to be a noble gas or to defy the trend due to relativistic effects; however, its composition has yet to be studied.
Under normal conditions, noble gases are colourless, odourless, tasteless, and nonflammable.
The noble gases are grouped in the periodic table according to their boiling point.
Noble gases are used in a variety of applications, ranging from incandescent lamps to excimer lasers.
Xenon is used as an anaesthetic because of its high lipid solubility, which makes it more active than nitrous oxide and because it is quickly eliminated from the bloodstream, allowing for quicker healing.
Via hyperpolarized MRI, xenon is used in medical imaging of the lungs.
In radiotherapy, radon is used, and is extremely radioactive and only present in trace quantities.
Hence option (B) is correct.
Note:
The properties of noble gases are well explained by contemporary atomic structure theories. Noble gases have a "full" outer shell of valence electrons, which makes them less likely to engage in chemical reactions. Just a few hundred noble gas compounds have been prepared so far. For eg, both the n = 1 and n = 2 shells of Neon (Ne) are complete, making it a stable monatomic gas under atmospheric conditions.
Latest Vedantu courses for you
Grade 11 Science PCM | CBSE | SCHOOL | English
CBSE (2025-26)
School Full course for CBSE students
₹41,848 per year
Recently Updated Pages
Master Class 11 Physics: Engaging Questions & Answers for Success

Master Class 11 Chemistry: Engaging Questions & Answers for Success

Master Class 11 Biology: Engaging Questions & Answers for Success

Class 11 Question and Answer - Your Ultimate Solutions Guide

Master Class 11 Business Studies: Engaging Questions & Answers for Success

Master Class 11 Computer Science: Engaging Questions & Answers for Success

Trending doubts
Explain why it is said like that Mock drill is use class 11 social science CBSE

The non protein part of an enzyme is a A Prosthetic class 11 biology CBSE

Which of the following blood vessels in the circulatory class 11 biology CBSE

What is a zygomorphic flower Give example class 11 biology CBSE

The deoxygenated blood from the hind limbs of the frog class 11 biology CBSE

What is the function of copulatory pads in the forelimbs class 11 biology CBSE
