Question

Out of $118$ elements known to us, how many of them are naturally occurring?
A.$98$
B.$99$
C.$100$
D.$101$

Answer 1

Hint: Naturally occurring elements: Those elements which are found in nature i.e. in earth’s crust, are called as naturally occurring elements.
Man-made elements: Those elements which are not found in nature but they can be made by man, are known as man-made elements.

Complete step by step answer:
First of all we will read about elements
Malleable: Those elements which can be hammered into very thin sheets, are known as malleable.
Ductile: Those elements which can be drawn into wire, are known as ductile.
Metallic lustre: Those elements which are shiny in nature are known as metallic lustre.
Elements: A substance which can be broken down further by chemical or physical method, is called as elements. Elements are categorized into two categories: metals and non-metals.
Metals: Those elements which are shiny in nature, hard to cut, malleable, ductile, good conductors of heat and electricity are in the category of metals.
Non-Metals: Those elements which are not shiny in nature, soft to cut, non-malleable, non-ductile, bad conductors of heat and electricity are in the category of non-metals.
Another classification of elements is on the basis of its occurrence in the environment.
Man-made elements: Those elements which are not found in nature but they can be made by man, are known as man-made elements. Examples are technetium, promethium, etc.
Naturally occurring elements: Those elements which are found in nature i.e. in earth’s crust, are called as naturally occurring elements. Examples are hydrogen, carbon, oxygen, etc.
Hence in nature there are $98$ naturally occurring elements.
So option A is correct.

Note:
There are not exactly $98$ man-made elements. They are $93 - 98$ in number. The elements found in earth’s crust may be large in quantity or may be small in quantity. But all those elements who are found in earth’s crust are known as naturally occurring elements.