Courses
Courses for Kids
Free study material
Offline Centres
More
Store

# The total number of atoms present in $CO_3^{2 - }$ is _______.A: $5$ B: $3$ C: $4$ D: $2$

Last updated date: 20th Jun 2024
Total views: 415.2k
Views today: 4.15k
Verified
415.2k+ views
Hint: A molecule is defined as a substance which is made up of atoms. Anything which we see around is composed of atoms. Atoms are the smallest unit of ordinary matter that forms a chemical element. Atoms are very small. The size of an atom is measured in picometers.

We know atoms are the smallest unit of anything which we see around us. A molecule is composed of two or more atoms. Oxygen is an element that is made up of atoms of oxygen. Similarly, hydrogen is also an element composed of hydrogen atoms. When two atoms of hydrogen combine with one atom of oxygen one water molecule is formed. The chemical formula of water is ${H_2}O$. The number of atoms in any molecule is calculated by adding subscripts of each element. If there is no subscript then it is taken one. Like in water, the subscript of hydrogen is $2$ and oxygen is $1$ (as it is not written). So, the total number of atoms is $2 + 1 = 3$ . Similarly, we can calculate the number of atoms in a given molecule that is $C{O_3}$. The subscript of carbon is $1$ and oxygen is $3$. So, the total number of atoms can be written as:
Total number of atoms$= 3 + 1 = 4$ .
So, the correct answer is option C that is $4$.