Question

How many elements are on Earth?

Answer 1

Hint: Many of the chemical elements are obtained from their natural sources and can be extracted from the earth crust. These elements are called as naturally occurring elements. In the periodic table total 118 elements are placed which are recognized by the International Union of Pure and Applied chemistry.

Complete step by step answer:
In chemistry the element is defined as the pure substance containing only one atom which has the same number of protons present in the nucleus of the atom. The element has the property to combine with other elements to form a new compound with similar or distinct properties.
The elements can be divided into two forms depending on their source. Some elements are naturally occurring and extracted from the earth surface and some elements are artificially synthesized.
There are a total 118 elements present in the periodic table out of which the first 94 chemical elements are naturally occurring and the remaining 24 chemical elements are artificially synthesized by the nuclear reaction.
The elements which are found in the earth are the chemical elements occurring from atomic number 1 (hydrogen) to 98 (californium).
Among these elements, ten elements occur in very trace amounts. The elements are: technetium (Z = 43), promethium (Z = 61), astatine (Z = 85), francium (Z = 87), neptunium ( Z= 93), plutonium (Z = 94), americium (Z =95), curium (Z = 96), berkelium (Z =97) and californium (Z = 98)Therefore, the number of elements presents in the earth is 94.

Note: The property of chemical elements is that they cannot be broken down in simpler forms. One new element has been added in the list. The element is known as Technetium. This element does not contain any stable isotopes.