Question

Chlorine and neon have atomicity of ………… and …………..
a.) One, three
b.) Three, two
c.) One, one
d.) Two, one

Answer 1

Hint: Try to recall the basic definition of atomicity. It is the number of atoms present in a molecule. Now you have to just find the number of atoms in chlorine and neon, and you will easily get your answer.

Complete step by step answer:

Now, let’s find the answer by discussing each term -

Atomicity - Atomicity is the total number of atoms present in a molecule of an element or compound. For example, Ozone(${ O }_{ 3 }$) has 3 oxygen atoms. So it's atomicity is 3.
Monoatomic - consists of one atom. Example-Na, K, Ne, etc.
Diatomic - Consists of two atoms. Example-${ O }_{ 2 }$, ${ N }_{ 2 }$, ${ H }_{ 2 }$, etc.
Triatomic - Consists of three atoms. Example- ${ O }_{ 3 }$.
Polyatomic - Consists of more than 3 atoms. Example- ${ P }_{ 4 }$, ${ S }_{ 8 }$ etc.
Here, chlorine exists as a ${ Cl }_{ 2 }$ molecule so its atomicity is two and neon is an inert gas so its atomicity is one.

There, we can say that the correct answer to this question is option D.

Additional information:
We should also know some basic properties of chlorine and neon -
Chlorine is a chemical element with the symbol Cl and atomic number 17. The second-lightest of the halogens. Chlorine is a yellow-green gas at room temperature.
Neon is a chemical element with the symbol Ne and atomic number 10. It is a noble gas. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air.

Note: Generally we see that metals are monoatomic and also noble or inert gases are monatomic.
Nonmetals vary from monoatomic, diatomic to polyatomic.