Answer
Verified
398.1k+ views
Hint: The word monatomic is a combination of two words ‘mono’ and ‘atomic’ which means ‘single atom’. The term is usually used for gases, monatomic gas is a gas in which there is a single atom or atom is not bound to anyone.
Complete answer:
Let us discuss the options one by one:
A. Nitrogen: Molecular nitrogen (${{\text{N}}_{2}}$) is a chemical compound in which two nitrogen atoms are bound with a triple bond together. Nitrogen gas is a colourless, tasteless and inert gas at normal conditions. About 78% of Earth's atmosphere is nitrogen (${{\text{N}}_{2}}$).
B. Hydrogen: Hydrogen molecule is the simplest molecule having a covalent bond. It is formed by two hydrogen atoms, each having one electron. Two electrons are shared in the covalent bond. It is represented by ${{\text{H}}_{2}}$.
C. Radon: A chemical element with the symbol $\text{Rn}$ and atomic number 86. Radon is a radioactive and colourless noble gas. Radon’s most stable isotope is $^{222}\text{Rn}$. Radioactivity has been used to kill cancerous cells. Radon produced commercially is used in radiation therapy.
D. Oxygen: At standard temperature and pressure, two atoms of oxygen bound to form dioxygen have the formula ${{\text{O}}_{2}}$; which is a colourless and odourless diatomic gas. ${{\text{O}}_{2}}$ is paramagnetic. It produces a magnetic field due to the spin magnetic moment of the unpaired electrons in the molecule.
So, the correct answer is “Option C”.
Note:Every element is monatomic but here we are talking about the existence of that element in nature. Elements that form stable homonuclear diatomic molecules at standard conditions (STP) are hydrogen gas (${{\text{H}}_{2}}$), nitrogen gas (${{\text{N}}_{2}}$), oxygen gas (${{\text{O}}_{2}}$) and chlorine gas ($\text{C}{{\text{l}}_{2}}$). The noble gases (like krypton, xenon, radon and other) are gases also stable at STP, but they exist as monatomic elements in nature.
Complete answer:
Let us discuss the options one by one:
A. Nitrogen: Molecular nitrogen (${{\text{N}}_{2}}$) is a chemical compound in which two nitrogen atoms are bound with a triple bond together. Nitrogen gas is a colourless, tasteless and inert gas at normal conditions. About 78% of Earth's atmosphere is nitrogen (${{\text{N}}_{2}}$).
B. Hydrogen: Hydrogen molecule is the simplest molecule having a covalent bond. It is formed by two hydrogen atoms, each having one electron. Two electrons are shared in the covalent bond. It is represented by ${{\text{H}}_{2}}$.
C. Radon: A chemical element with the symbol $\text{Rn}$ and atomic number 86. Radon is a radioactive and colourless noble gas. Radon’s most stable isotope is $^{222}\text{Rn}$. Radioactivity has been used to kill cancerous cells. Radon produced commercially is used in radiation therapy.
D. Oxygen: At standard temperature and pressure, two atoms of oxygen bound to form dioxygen have the formula ${{\text{O}}_{2}}$; which is a colourless and odourless diatomic gas. ${{\text{O}}_{2}}$ is paramagnetic. It produces a magnetic field due to the spin magnetic moment of the unpaired electrons in the molecule.
So, the correct answer is “Option C”.
Note:Every element is monatomic but here we are talking about the existence of that element in nature. Elements that form stable homonuclear diatomic molecules at standard conditions (STP) are hydrogen gas (${{\text{H}}_{2}}$), nitrogen gas (${{\text{N}}_{2}}$), oxygen gas (${{\text{O}}_{2}}$) and chlorine gas ($\text{C}{{\text{l}}_{2}}$). The noble gases (like krypton, xenon, radon and other) are gases also stable at STP, but they exist as monatomic elements in nature.
Recently Updated Pages
Basicity of sulphurous acid and sulphuric acid are
Three beakers labelled as A B and C each containing 25 mL of water were taken A small amount of NaOH anhydrous CuSO4 and NaCl were added to the beakers A B and C respectively It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas in case of beaker C the temperature of the solution falls Which one of the following statements isarecorrect i In beakers A and B exothermic process has occurred ii In beakers A and B endothermic process has occurred iii In beaker C exothermic process has occurred iv In beaker C endothermic process has occurred
What is the stopping potential when the metal with class 12 physics JEE_Main
The momentum of a photon is 2 times 10 16gm cmsec Its class 12 physics JEE_Main
How do you arrange NH4 + BF3 H2O C2H2 in increasing class 11 chemistry CBSE
Is H mCT and q mCT the same thing If so which is more class 11 chemistry CBSE
Trending doubts
Difference Between Plant Cell and Animal Cell
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
Summary of the poem Where the Mind is Without Fear class 8 english CBSE
Give 10 examples for herbs , shrubs , climbers , creepers
Write an application to the principal requesting five class 10 english CBSE
What organs are located on the left side of your body class 11 biology CBSE
What is the z value for a 90 95 and 99 percent confidence class 11 maths CBSE