Question

Assertion: Carbon monoxide is considered a compound but carbon and oxygen as elements.
Reason: A chemical element is a pure chemical substance consisting of a single type of atom distinguished by its atomic number, which is the number of protons in its atomic nucleus. While the compound is composed of two or more separate elements.
(A) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(B) Both Assertion and Reason are correct and Reason is not the correct explanation of Assertion.
(C) Assertion is correct but Reason is incorrect
(D) Both Assertion and Reason are incorrect.

Answer 1

Hint: It is a basic chemistry question of chemistry. To solve this we should know about atoms' different properties. Atoms are basic units of material. Atoms can differentiate according to their atomic number as well as their mass number.
Atomic number: - the number of protons present in its nucleus.
Mass number:- the sum of the number of neutrons and protons present in the nucleus.

Complete step by step answer:
As we know that,
A chemical element is a material which consists of the same type of atom. Each atom has the same atomic number, that is the number of protons in its nucleus. Elements are distinguished from others by atomic number.
For example: - Hydrogen $(H)$ , Carbon $(C)$ , Oxygen $(O)$ .
 A compound is a synthetic type that is framed when two or more atom particles are held together to each other by covalent or ionic bonds. They held in such a way that they fulfilled the octet rule.
For example: $NaCl,C{O}_2,H_{2}O$ etc.
In this way, Carbon Monoxide is viewed as a compound however carbon and oxygen are elements.
So, the assertion as well as the reason are true.

Additional Information:
The Octet Rule requires all particles in an atom to have 8 valence electrons- - either by sharing, losing or picking up electrons- - to get steady. For Covalent bonds, iotas will in general impart their electrons to one another to fulfill the Octet Rule. It requires 8 electrons since that is the measure of electrons expected to fill a s-and p-orbital (electron design); otherwise called an honorable gas setup. Every molecule needs to get as steady as the honorable gases that have their external valence shell filled in light of the fact that respectable gases have a charge of 0. Despite the fact that it is essential to recollect the "magic number", 8.

Note :
Covalent holding happens when sets of electrons are shared by particles. Molecules will covalently bond with different particles to acquire strength, which is picked up by framing a full electron shell. By sharing their external most (valence) electrons, particles can top off their external electron shell and increase solidness. Nonmetals will promptly frame covalent bonds with different nonmetals to acquire steadiness, and can shape anyplace between one to three covalent bonds with different nonmetals relying upon the number of valence electrons they group.